Finding the Fourth Proportional to 1,155.05, 1,593.98 and 631.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.05 : 1,593.98 = 631.07 : x
2. Step 2: Convert to fraction form
   1,155.05/1,593.98 = 631.07/x
3. Step 3: Cross multiply
   1,155.05x = 1,593.98 × 631.07
4. Step 4: Simplify right side
   1,155.05x = 1,005,912.96
5. Step 5: Solve for x
   x = 1,005,912.96/1,155.05
6. Step 6: Final answer
   x = 870.88