Finding the Fourth Proportional to 1,017.16, 1,403.88 and 663.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.16 : 1,403.88 = 663.52 : x
2. Step 2: Convert to fraction form
   1,017.16/1,403.88 = 663.52/x
3. Step 3: Cross multiply
   1,017.16x = 1,403.88 × 663.52
4. Step 4: Simplify right side
   1,017.16x = 931,502.46
5. Step 5: Solve for x
   x = 931,502.46/1,017.16
6. Step 6: Final answer
   x = 915.79