Finding the Fourth Proportional to 2,758,978.72, 4,138,642.96 and 865,794.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,758,978.72 : 4,138,642.96 = 865,794.88 : x
2. Step 2: Convert to fraction form
   2,758,978.72/4,138,642.96 = 865,794.88/x
3. Step 3: Cross multiply
   2,758,978.72x = 4,138,642.96 × 865,794.88
4. Step 4: Simplify right side
   2,758,978.72x = 3,583,215,884,916.05
5. Step 5: Solve for x
   x = 3,583,215,884,916.05/2,758,978.72
6. Step 6: Final answer
   x = 1,298,747.20