Finding the Fourth Proportional to 31,434.69, 43,379.90 and 17,287.55

Step by Step Solution

1. Step 1: Write the proportion equation
   31,434.69 : 43,379.90 = 17,287.55 : x
2. Step 2: Convert to fraction form
   31,434.69/43,379.90 = 17,287.55/x
3. Step 3: Cross multiply
   31,434.69x = 43,379.90 × 17,287.55
4. Step 4: Simplify right side
   31,434.69x = 749,931,886.91
5. Step 5: Solve for x
   x = 749,931,886.91/31,434.69
6. Step 6: Final answer
   x = 23,856.82