Finding the Fourth Proportional to 77,123.34, 106,209.47 and 72,317.52

Step by Step Solution

1. Step 1: Write the proportion equation
   77,123.34 : 106,209.47 = 72,317.52 : x
2. Step 2: Convert to fraction form
   77,123.34/106,209.47 = 72,317.52/x
3. Step 3: Cross multiply
   77,123.34x = 106,209.47 × 72,317.52
4. Step 4: Simplify right side
   77,123.34x = 7,680,805,651.71
5. Step 5: Solve for x
   x = 7,680,805,651.71/77,123.34
6. Step 6: Final answer
   x = 99,591.20