Finding the Fourth Proportional to 1,130.98, 1,560.72 and 688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,130.98 : 1,560.72 = 688.72 : x
2. Step 2: Convert to fraction form
   1,130.98/1,560.72 = 688.72/x
3. Step 3: Cross multiply
   1,130.98x = 1,560.72 × 688.72
4. Step 4: Simplify right side
   1,130.98x = 1,074,899.08
5. Step 5: Solve for x
   x = 1,074,899.08/1,130.98
6. Step 6: Final answer
   x = 950.41