Finding the Fourth Proportional to 100,766.16, 139,070.88 and 57,762.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,766.16 : 139,070.88 = 57,762.72 : x
2. Step 2: Convert to fraction form
   100,766.16/139,070.88 = 57,762.72/x
3. Step 3: Cross multiply
   100,766.16x = 139,070.88 × 57,762.72
4. Step 4: Simplify right side
   100,766.16x = 8,033,112,301.59
5. Step 5: Solve for x
   x = 8,033,112,301.59/100,766.16
6. Step 6: Final answer
   x = 79,720.34