Finding the Fourth Proportional to 1,131.10, 1,560.47 and 688.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,131.10 : 1,560.47 = 688.84 : x
2. Step 2: Convert to fraction form
   1,131.10/1,560.47 = 688.84/x
3. Step 3: Cross multiply
   1,131.10x = 1,560.47 × 688.84
4. Step 4: Simplify right side
   1,131.10x = 1,074,906.81
5. Step 5: Solve for x
   x = 1,074,906.81/1,131.10
6. Step 6: Final answer
   x = 950.32