Finding the Fourth Proportional to 1,142.52, 1,714.74 and 915.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.52 : 1,714.74 = 915.96 : x
2. Step 2: Convert to fraction form
   1,142.52/1,714.74 = 915.96/x
3. Step 3: Cross multiply
   1,142.52x = 1,714.74 × 915.96
4. Step 4: Simplify right side
   1,142.52x = 1,570,633.25
5. Step 5: Solve for x
   x = 1,570,633.25/1,142.52
6. Step 6: Final answer
   x = 1,374.71