Finding the Fourth Proportional to 1,139.69, 1,573.71 and 697.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.69 : 1,573.71 = 697.84 : x
2. Step 2: Convert to fraction form
   1,139.69/1,573.71 = 697.84/x
3. Step 3: Cross multiply
   1,139.69x = 1,573.71 × 697.84
4. Step 4: Simplify right side
   1,139.69x = 1,098,197.79
5. Step 5: Solve for x
   x = 1,098,197.79/1,139.69
6. Step 6: Final answer
   x = 963.59