Finding the Fourth Proportional to 1,139.89, 1,573.07 and 698.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.89 : 1,573.07 = 698.03 : x
2. Step 2: Convert to fraction form
   1,139.89/1,573.07 = 698.03/x
3. Step 3: Cross multiply
   1,139.89x = 1,573.07 × 698.03
4. Step 4: Simplify right side
   1,139.89x = 1,098,050.49
5. Step 5: Solve for x
   x = 1,098,050.49/1,139.89
6. Step 6: Final answer
   x = 963.30