Finding the Fourth Proportional to 31,276.80, 43,160.04 and 17,128.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,276.80 : 43,160.04 = 17,128.80 : x
2. Step 2: Convert to fraction form
   31,276.80/43,160.04 = 17,128.80/x
3. Step 3: Cross multiply
   31,276.80x = 43,160.04 × 17,128.80
4. Step 4: Simplify right side
   31,276.80x = 739,279,693.15
5. Step 5: Solve for x
   x = 739,279,693.15/31,276.80
6. Step 6: Final answer
   x = 23,636.68