Finding the Fourth Proportional to 1,139.13, 1,572.72 and 697.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.13 : 1,572.72 = 697.48 : x
2. Step 2: Convert to fraction form
   1,139.13/1,572.72 = 697.48/x
3. Step 3: Cross multiply
   1,139.13x = 1,572.72 × 697.48
4. Step 4: Simplify right side
   1,139.13x = 1,096,934.20
5. Step 5: Solve for x
   x = 1,096,934.20/1,139.13
6. Step 6: Final answer
   x = 962.96