Finding the Fourth Proportional to 31,387.69, 43,315.05 and 17,240.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,387.69 : 43,315.05 = 17,240.50 : x
2. Step 2: Convert to fraction form
   31,387.69/43,315.05 = 17,240.50/x
3. Step 3: Cross multiply
   31,387.69x = 43,315.05 × 17,240.50
4. Step 4: Simplify right side
   31,387.69x = 746,773,119.53
5. Step 5: Solve for x
   x = 746,773,119.53/31,387.69
6. Step 6: Final answer
   x = 23,791.91