Finding the Fourth Proportional to 91,632.72, 137,470.59 and 28,449.63

Step by Step Solution

1. Step 1: Write the proportion equation
   91,632.72 : 137,470.59 = 28,449.63 : x
2. Step 2: Convert to fraction form
   91,632.72/137,470.59 = 28,449.63/x
3. Step 3: Cross multiply
   91,632.72x = 137,470.59 × 28,449.63
4. Step 4: Simplify right side
   91,632.72x = 3,910,987,421.38
5. Step 5: Solve for x
   x = 3,910,987,421.38/91,632.72
6. Step 6: Final answer
   x = 42,681.12