Finding the Fourth Proportional to 1,155.50, 1,594.61 and 631.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.50 : 1,594.61 = 631.55 : x
2. Step 2: Convert to fraction form
   1,155.50/1,594.61 = 631.55/x
3. Step 3: Cross multiply
   1,155.50x = 1,594.61 × 631.55
4. Step 4: Simplify right side
   1,155.50x = 1,007,075.95
5. Step 5: Solve for x
   x = 1,007,075.95/1,155.50
6. Step 6: Final answer
   x = 871.55