Finding the Fourth Proportional to 1,155.57, 1,594.69 and 631.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.57 : 1,594.69 = 631.60 : x
2. Step 2: Convert to fraction form
   1,155.57/1,594.69 = 631.60/x
3. Step 3: Cross multiply
   1,155.57x = 1,594.69 × 631.60
4. Step 4: Simplify right side
   1,155.57x = 1,007,205.98
5. Step 5: Solve for x
   x = 1,007,205.98/1,155.57
6. Step 6: Final answer
   x = 871.61