Finding the Fourth Proportional to 100,880.52, 139,215.15 and 56,168.52

Step by Step Solution

1. Step 1: Write the proportion equation
   100,880.52 : 139,215.15 = 56,168.52 : x
2. Step 2: Convert to fraction form
   100,880.52/139,215.15 = 56,168.52/x
3. Step 3: Cross multiply
   100,880.52x = 139,215.15 × 56,168.52
4. Step 4: Simplify right side
   100,880.52x = 7,819,508,937.08
5. Step 5: Solve for x
   x = 7,819,508,937.08/100,880.52
6. Step 6: Final answer
   x = 77,512.58