Finding the Fourth Proportional to 31,128.35, 42,960.80 and 17,701.62

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.35 : 42,960.80 = 17,701.62 : x
2. Step 2: Convert to fraction form
   31,128.35/42,960.80 = 17,701.62/x
3. Step 3: Cross multiply
   31,128.35x = 42,960.80 × 17,701.62
4. Step 4: Simplify right side
   31,128.35x = 760,475,541.69
5. Step 5: Solve for x
   x = 760,475,541.69/31,128.35
6. Step 6: Final answer
   x = 24,430.32