Finding the Fourth Proportional to 1,007.78, 1,512.27 and 925.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.78 : 1,512.27 = 925.16 : x
2. Step 2: Convert to fraction form
   1,007.78/1,512.27 = 925.16/x
3. Step 3: Cross multiply
   1,007.78x = 1,512.27 × 925.16
4. Step 4: Simplify right side
   1,007.78x = 1,399,084.15
5. Step 5: Solve for x
   x = 1,399,084.15/1,007.78
6. Step 6: Final answer
   x = 1,388.29