Finding the Fourth Proportional to 1,131.01, 1,560.52 and 688.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.01 : 1,560.52 = 688.60 : x
2. Step 2: Convert to fraction form
   1,131.01/1,560.52 = 688.60/x
3. Step 3: Cross multiply
   1,131.01x = 1,560.52 × 688.60
4. Step 4: Simplify right side
   1,131.01x = 1,074,573.01
5. Step 5: Solve for x
   x = 1,074,573.01/1,131.01
6. Step 6: Final answer
   x = 950.10