Finding the Fourth Proportional to 72,060.50, 99,443.50 and 40,229.40

Step by Step Solution

1. Step 1: Write the proportion equation
   72,060.50 : 99,443.50 = 40,229.40 : x
2. Step 2: Convert to fraction form
   72,060.50/99,443.50 = 40,229.40/x
3. Step 3: Cross multiply
   72,060.50x = 99,443.50 × 40,229.40
4. Step 4: Simplify right side
   72,060.50x = 4,000,552,238.33
5. Step 5: Solve for x
   x = 4,000,552,238.33/72,060.50
6. Step 6: Final answer
   x = 55,516.57