Finding the Fourth Proportional to 72,131.65, 99,538.49 and 40,299.86

Step by Step Solution

1. Step 1: Write the proportion equation
   72,131.65 : 99,538.49 = 40,299.86 : x
2. Step 2: Convert to fraction form
   72,131.65/99,538.49 = 40,299.86/x
3. Step 3: Cross multiply
   72,131.65x = 99,538.49 × 40,299.86
4. Step 4: Simplify right side
   72,131.65x = 4,011,387,561.21
5. Step 5: Solve for x
   x = 4,011,387,561.21/72,131.65
6. Step 6: Final answer
   x = 55,612.03