Finding the Fourth Proportional to 78,807.16, 108,719.58 and 51,915.16

Step by Step Solution

1. Step 1: Write the proportion equation
   78,807.16 : 108,719.58 = 51,915.16 : x
2. Step 2: Convert to fraction form
   78,807.16/108,719.58 = 51,915.16/x
3. Step 3: Cross multiply
   78,807.16x = 108,719.58 × 51,915.16
4. Step 4: Simplify right side
   78,807.16x = 5,644,194,390.83
5. Step 5: Solve for x
   x = 5,644,194,390.83/78,807.16
6. Step 6: Final answer
   x = 71,620.32