Finding the Fourth Proportional to 1,017.18, 1,526.17 and 432.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.18 : 1,526.17 = 432.31 : x
2. Step 2: Convert to fraction form
   1,017.18/1,526.17 = 432.31/x
3. Step 3: Cross multiply
   1,017.18x = 1,526.17 × 432.31
4. Step 4: Simplify right side
   1,017.18x = 659,778.55
5. Step 5: Solve for x
   x = 659,778.55/1,017.18
6. Step 6: Final answer
   x = 648.64