Finding the Fourth Proportional to 1,151.78, 1,589.75 and 710.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.78 : 1,589.75 = 710.04 : x
2. Step 2: Convert to fraction form
   1,151.78/1,589.75 = 710.04/x
3. Step 3: Cross multiply
   1,151.78x = 1,589.75 × 710.04
4. Step 4: Simplify right side
   1,151.78x = 1,128,782.54
5. Step 5: Solve for x
   x = 1,128,782.54/1,151.78
6. Step 6: Final answer
   x = 980.04