Finding the Fourth Proportional to 72,150.91, 99,570.38 and 40,319.88

Step by Step Solution

1. Step 1: Write the proportion equation
   72,150.91 : 99,570.38 = 40,319.88 : x
2. Step 2: Convert to fraction form
   72,150.91/99,570.38 = 40,319.88/x
3. Step 3: Cross multiply
   72,150.91x = 99,570.38 × 40,319.88
4. Step 4: Simplify right side
   72,150.91x = 4,014,665,773.15
5. Step 5: Solve for x
   x = 4,014,665,773.15/72,150.91
6. Step 6: Final answer
   x = 55,642.62