Finding the Fourth Proportional to 1,139.06, 1,572.19 and 697.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.06 : 1,572.19 = 697.34 : x
2. Step 2: Convert to fraction form
   1,139.06/1,572.19 = 697.34/x
3. Step 3: Cross multiply
   1,139.06x = 1,572.19 × 697.34
4. Step 4: Simplify right side
   1,139.06x = 1,096,353.16
5. Step 5: Solve for x
   x = 1,096,353.16/1,139.06
6. Step 6: Final answer
   x = 962.50