Finding the Fourth Proportional to 1,061.78, 1,464.75 and 689.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.78 : 1,464.75 = 689.09 : x
2. Step 2: Convert to fraction form
   1,061.78/1,464.75 = 689.09/x
3. Step 3: Cross multiply
   1,061.78x = 1,464.75 × 689.09
4. Step 4: Simplify right side
   1,061.78x = 1,009,337.25
5. Step 5: Solve for x
   x = 1,009,337.25/1,061.78
6. Step 6: Final answer
   x = 950.61