Finding the Fourth Proportional to 1,150.40, 1,587.42 and 708.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.40 : 1,587.42 = 708.30 : x
2. Step 2: Convert to fraction form
   1,150.40/1,587.42 = 708.30/x
3. Step 3: Cross multiply
   1,150.40x = 1,587.42 × 708.30
4. Step 4: Simplify right side
   1,150.40x = 1,124,369.59
5. Step 5: Solve for x
   x = 1,124,369.59/1,150.40
6. Step 6: Final answer
   x = 977.37