Finding the Fourth Proportional to 1,150.56, 1,587.28 and 708.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.56 : 1,587.28 = 708.30 : x
2. Step 2: Convert to fraction form
   1,150.56/1,587.28 = 708.30/x
3. Step 3: Cross multiply
   1,150.56x = 1,587.28 × 708.30
4. Step 4: Simplify right side
   1,150.56x = 1,124,270.42
5. Step 5: Solve for x
   x = 1,124,270.42/1,150.56
6. Step 6: Final answer
   x = 977.15