Finding the Fourth Proportional to 1,393.61, 2,087.17 and 1,174.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.61 : 2,087.17 = 1,174.91 : x
2. Step 2: Convert to fraction form
   1,393.61/2,087.17 = 1,174.91/x
3. Step 3: Cross multiply
   1,393.61x = 2,087.17 × 1,174.91
4. Step 4: Simplify right side
   1,393.61x = 2,452,223.53
5. Step 5: Solve for x
   x = 2,452,223.53/1,393.61
6. Step 6: Final answer
   x = 1,759.63