Finding the Fourth Proportional to 1,105.92, 1,526.22 and 640.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,105.92 : 1,526.22 = 640.14 : x
2. Step 2: Convert to fraction form
   1,105.92/1,526.22 = 640.14/x
3. Step 3: Cross multiply
   1,105.92x = 1,526.22 × 640.14
4. Step 4: Simplify right side
   1,105.92x = 976,994.47
5. Step 5: Solve for x
   x = 976,994.47/1,105.92
6. Step 6: Final answer
   x = 883.42