Finding the Fourth Proportional to 78,801.16, 108,711.30 and 51,909.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,801.16 : 108,711.30 = 51,909.16 : x
2. Step 2: Convert to fraction form
   78,801.16/108,711.30 = 51,909.16/x
3. Step 3: Cross multiply
   78,801.16x = 108,711.30 × 51,909.16
4. Step 4: Simplify right side
   78,801.16x = 5,643,112,265.51
5. Step 5: Solve for x
   x = 5,643,112,265.51/78,801.16
6. Step 6: Final answer
   x = 71,612.05