Finding the Fourth Proportional to 1,151.57, 1,589.20 and 709.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.57 : 1,589.20 = 709.72 : x
2. Step 2: Convert to fraction form
   1,151.57/1,589.20 = 709.72/x
3. Step 3: Cross multiply
   1,151.57x = 1,589.20 × 709.72
4. Step 4: Simplify right side
   1,151.57x = 1,127,887.02
5. Step 5: Solve for x
   x = 1,127,887.02/1,151.57
6. Step 6: Final answer
   x = 979.43