Finding the Fourth Proportional to 1,031.10, 1,422.24 and 715.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.10 : 1,422.24 = 715.86 : x
2. Step 2: Convert to fraction form
   1,031.10/1,422.24 = 715.86/x
3. Step 3: Cross multiply
   1,031.10x = 1,422.24 × 715.86
4. Step 4: Simplify right side
   1,031.10x = 1,018,124.73
5. Step 5: Solve for x
   x = 1,018,124.73/1,031.10
6. Step 6: Final answer
   x = 987.42