Finding the Fourth Proportional to 100,825, 139,138.50 and 56,123.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100,825 : 139,138.50 = 56,123.56 : x
2. Step 2: Convert to fraction form
   100,825/139,138.50 = 56,123.56/x
3. Step 3: Cross multiply
   100,825x = 139,138.50 × 56,123.56
4. Step 4: Simplify right side
   100,825x = 7,808,947,953.06
5. Step 5: Solve for x
   x = 7,808,947,953.06/100,825
6. Step 6: Final answer
   x = 77,450.51