Finding the Fourth Proportional to 1,061.51, 1,464.48 and 688.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.51 : 1,464.48 = 688.57 : x
2. Step 2: Convert to fraction form
   1,061.51/1,464.48 = 688.57/x
3. Step 3: Cross multiply
   1,061.51x = 1,464.48 × 688.57
4. Step 4: Simplify right side
   1,061.51x = 1,008,393.33
5. Step 5: Solve for x
   x = 1,008,393.33/1,061.51
6. Step 6: Final answer
   x = 949.97