Finding the Fourth Proportional to 1,358.15, 1,875.78 and 915.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.15 : 1,875.78 = 915.28 : x
2. Step 2: Convert to fraction form
   1,358.15/1,875.78 = 915.28/x
3. Step 3: Cross multiply
   1,358.15x = 1,875.78 × 915.28
4. Step 4: Simplify right side
   1,358.15x = 1,716,854.54
5. Step 5: Solve for x
   x = 1,716,854.54/1,358.15
6. Step 6: Final answer
   x = 1,264.12