Finding the Fourth Proportional to 1,155.71, 1,594.89 and 631.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.71 : 1,594.89 = 631.74 : x
2. Step 2: Convert to fraction form
   1,155.71/1,594.89 = 631.74/x
3. Step 3: Cross multiply
   1,155.71x = 1,594.89 × 631.74
4. Step 4: Simplify right side
   1,155.71x = 1,007,555.81
5. Step 5: Solve for x
   x = 1,007,555.81/1,155.71
6. Step 6: Final answer
   x = 871.81