Finding the Fourth Proportional to 1,139.88, 1,709.82 and 653.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.88 : 1,709.82 = 653.24 : x
2. Step 2: Convert to fraction form
   1,139.88/1,709.82 = 653.24/x
3. Step 3: Cross multiply
   1,139.88x = 1,709.82 × 653.24
4. Step 4: Simplify right side
   1,139.88x = 1,116,922.82
5. Step 5: Solve for x
   x = 1,116,922.82/1,139.88
6. Step 6: Final answer
   x = 979.86