Finding the Fourth Proportional to 1,358.17, 1,873.69 and 915.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.17 : 1,873.69 = 915.30 : x
2. Step 2: Convert to fraction form
   1,358.17/1,873.69 = 915.30/x
3. Step 3: Cross multiply
   1,358.17x = 1,873.69 × 915.30
4. Step 4: Simplify right side
   1,358.17x = 1,714,986.17
5. Step 5: Solve for x
   x = 1,714,986.17/1,358.17
6. Step 6: Final answer
   x = 1,262.72