Finding the Fourth Proportional to 1,151.34, 1,588.56 and 915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.34 : 1,588.56 = 915.30 : x
2. Step 2: Convert to fraction form
   1,151.34/1,588.56 = 915.30/x
3. Step 3: Cross multiply
   1,151.34x = 1,588.56 × 915.30
4. Step 4: Simplify right side
   1,151.34x = 1,454,008.97
5. Step 5: Solve for x
   x = 1,454,008.97/1,151.34
6. Step 6: Final answer
   x = 1,262.88