Finding the Fourth Proportional to 1,152.16, 1,590.56 and 710.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.16 : 1,590.56 = 710.31 : x
2. Step 2: Convert to fraction form
   1,152.16/1,590.56 = 710.31/x
3. Step 3: Cross multiply
   1,152.16x = 1,590.56 × 710.31
4. Step 4: Simplify right side
   1,152.16x = 1,129,792.45
5. Step 5: Solve for x
   x = 1,129,792.45/1,152.16
6. Step 6: Final answer
   x = 980.59