Finding the Fourth Proportional to 915.67, 1,262.52 and 636.15

Step by Step Solution

1. Step 1: Write the proportion equation
   915.67 : 1,262.52 = 636.15 : x
2. Step 2: Convert to fraction form
   915.67/1,262.52 = 636.15/x
3. Step 3: Cross multiply
   915.67x = 1,262.52 × 636.15
4. Step 4: Simplify right side
   915.67x = 803,152.10
5. Step 5: Solve for x
   x = 803,152.10/915.67
6. Step 6: Final answer
   x = 877.12