Finding the Fourth Proportional to 2,109,902,616.56, 3,165,198,077.10 and 865,999,238.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,109,902,616.56 : 3,165,198,077.10 = 865,999,238.60 : x
2. Step 2: Convert to fraction form
   2,109,902,616.56/3,165,198,077.10 = 865,999,238.60/x
3. Step 3: Cross multiply
   2,109,902,616.56x = 3,165,198,077.10 × 865,999,238.60
4. Step 4: Simplify right side
   2,109,902,616.56x = 2,741,059,124,786,784,256
5. Step 5: Solve for x
   x = 2,741,059,124,786,784,256/2,109,902,616.56
6. Step 6: Final answer
   x = 1,299,140,113.52