Finding the Fourth Proportional to 1,158.85, 1,599.31 and 710.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,158.85 : 1,599.31 = 710.72 : x
2. Step 2: Convert to fraction form
   1,158.85/1,599.31 = 710.72/x
3. Step 3: Cross multiply
   1,158.85x = 1,599.31 × 710.72
4. Step 4: Simplify right side
   1,158.85x = 1,136,661.60
5. Step 5: Solve for x
   x = 1,136,661.60/1,158.85
6. Step 6: Final answer
   x = 980.85