Finding the Fourth Proportional to 1,139.98, 1,572.83 and 697.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.98 : 1,572.83 = 697.42 : x
2. Step 2: Convert to fraction form
   1,139.98/1,572.83 = 697.42/x
3. Step 3: Cross multiply
   1,139.98x = 1,572.83 × 697.42
4. Step 4: Simplify right side
   1,139.98x = 1,096,923.10
5. Step 5: Solve for x
   x = 1,096,923.10/1,139.98
6. Step 6: Final answer
   x = 962.23