Finding the Fourth Proportional to 1,061.60, 1,465.34 and 687.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.60 : 1,465.34 = 687.92 : x
2. Step 2: Convert to fraction form
   1,061.60/1,465.34 = 687.92/x
3. Step 3: Cross multiply
   1,061.60x = 1,465.34 × 687.92
4. Step 4: Simplify right side
   1,061.60x = 1,008,025.93
5. Step 5: Solve for x
   x = 1,008,025.93/1,061.60
6. Step 6: Final answer
   x = 949.54