Finding the Fourth Proportional to 72,450.72, 99,979.92 and 42,242.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,450.72 : 99,979.92 = 42,242.72 : x
2. Step 2: Convert to fraction form
   72,450.72/99,979.92 = 42,242.72/x
3. Step 3: Cross multiply
   72,450.72x = 99,979.92 × 42,242.72
4. Step 4: Simplify right side
   72,450.72x = 4,223,423,766.18
5. Step 5: Solve for x
   x = 4,223,423,766.18/72,450.72
6. Step 6: Final answer
   x = 58,293.74