Finding the Fourth Proportional to 1,061.46, 1,464.45 and 688.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.46 : 1,464.45 = 688.91 : x
2. Step 2: Convert to fraction form
   1,061.46/1,464.45 = 688.91/x
3. Step 3: Cross multiply
   1,061.46x = 1,464.45 × 688.91
4. Step 4: Simplify right side
   1,061.46x = 1,008,866.93
5. Step 5: Solve for x
   x = 1,008,866.93/1,061.46
6. Step 6: Final answer
   x = 950.45