Finding the Fourth Proportional to 1,139.84, 1,573.82 and 698.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.84 : 1,573.82 = 698.34 : x
2. Step 2: Convert to fraction form
   1,139.84/1,573.82 = 698.34/x
3. Step 3: Cross multiply
   1,139.84x = 1,573.82 × 698.34
4. Step 4: Simplify right side
   1,139.84x = 1,099,057.97
5. Step 5: Solve for x
   x = 1,099,057.97/1,139.84
6. Step 6: Final answer
   x = 964.23