Finding the Fourth Proportional to 1,139.56, 1,710.56 and 523.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.56 : 1,710.56 = 523.76 : x
2. Step 2: Convert to fraction form
   1,139.56/1,710.56 = 523.76/x
3. Step 3: Cross multiply
   1,139.56x = 1,710.56 × 523.76
4. Step 4: Simplify right side
   1,139.56x = 895,915.66
5. Step 5: Solve for x
   x = 895,915.66/1,139.56
6. Step 6: Final answer
   x = 786.20