Finding the Fourth Proportional to 142,108.72, 196,111.40 and 78,445.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,108.72 : 196,111.40 = 78,445.15 : x
2. Step 2: Convert to fraction form
   142,108.72/196,111.40 = 78,445.15/x
3. Step 3: Cross multiply
   142,108.72x = 196,111.40 × 78,445.15
4. Step 4: Simplify right side
   142,108.72x = 15,383,988,189.71
5. Step 5: Solve for x
   x = 15,383,988,189.71/142,108.72
6. Step 6: Final answer
   x = 108,255.06