Finding the Fourth Proportional to 31,434.86, 43,379.88 and 17,287.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,434.86 : 43,379.88 = 17,287.40 : x
2. Step 2: Convert to fraction form
   31,434.86/43,379.88 = 17,287.40/x
3. Step 3: Cross multiply
   31,434.86x = 43,379.88 × 17,287.40
4. Step 4: Simplify right side
   31,434.86x = 749,925,337.51
5. Step 5: Solve for x
   x = 749,925,337.51/31,434.86
6. Step 6: Final answer
   x = 23,856.49