Finding the Fourth Proportional to 72,439.50, 99,966.88 and 42,245.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,439.50 : 99,966.88 = 42,245.76 : x
2. Step 2: Convert to fraction form
   72,439.50/99,966.88 = 42,245.76/x
3. Step 3: Cross multiply
   72,439.50x = 99,966.88 × 42,245.76
4. Step 4: Simplify right side
   72,439.50x = 4,223,176,820.43
5. Step 5: Solve for x
   x = 4,223,176,820.43/72,439.50
6. Step 6: Final answer
   x = 58,299.36