Finding the Fourth Proportional to 1,130.27, 1,559.31 and 688.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,130.27 : 1,559.31 = 688.10 : x
2. Step 2: Convert to fraction form
   1,130.27/1,559.31 = 688.10/x
3. Step 3: Cross multiply
   1,130.27x = 1,559.31 × 688.10
4. Step 4: Simplify right side
   1,130.27x = 1,072,961.21
5. Step 5: Solve for x
   x = 1,072,961.21/1,130.27
6. Step 6: Final answer
   x = 949.30