Finding the Fourth Proportional to 1,155.32, 1,594.35 and 631.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.32 : 1,594.35 = 631.40 : x
2. Step 2: Convert to fraction form
   1,155.32/1,594.35 = 631.40/x
3. Step 3: Cross multiply
   1,155.32x = 1,594.35 × 631.40
4. Step 4: Simplify right side
   1,155.32x = 1,006,672.59
5. Step 5: Solve for x
   x = 1,006,672.59/1,155.32
6. Step 6: Final answer
   x = 871.34