Finding the Fourth Proportional to 100,824.50, 139,137.81 and 56,123.06

Step by Step Solution

1. Step 1: Write the proportion equation
   100,824.50 : 139,137.81 = 56,123.06 : x
2. Step 2: Convert to fraction form
   100,824.50/139,137.81 = 56,123.06/x
3. Step 3: Cross multiply
   100,824.50x = 139,137.81 × 56,123.06
4. Step 4: Simplify right side
   100,824.50x = 7,808,839,658.90
5. Step 5: Solve for x
   x = 7,808,839,658.90/100,824.50
6. Step 6: Final answer
   x = 77,449.82