Finding the Fourth Proportional to 1,155.20, 1,593.81 and 657.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.20 : 1,593.81 = 657.72 : x
2. Step 2: Convert to fraction form
   1,155.20/1,593.81 = 657.72/x
3. Step 3: Cross multiply
   1,155.20x = 1,593.81 × 657.72
4. Step 4: Simplify right side
   1,155.20x = 1,048,280.71
5. Step 5: Solve for x
   x = 1,048,280.71/1,155.20
6. Step 6: Final answer
   x = 907.45