Finding the Fourth Proportional to 1,250.78, 1,726.02 and 691.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,250.78 : 1,726.02 = 691.25 : x
2. Step 2: Convert to fraction form
   1,250.78/1,726.02 = 691.25/x
3. Step 3: Cross multiply
   1,250.78x = 1,726.02 × 691.25
4. Step 4: Simplify right side
   1,250.78x = 1,193,102.69
5. Step 5: Solve for x
   x = 1,193,102.69/1,250.78
6. Step 6: Final answer
   x = 953.89