Finding the Fourth Proportional to 1,007.30, 1,389.22 and 910.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.30 : 1,389.22 = 910.10 : x
2. Step 2: Convert to fraction form
   1,007.30/1,389.22 = 910.10/x
3. Step 3: Cross multiply
   1,007.30x = 1,389.22 × 910.10
4. Step 4: Simplify right side
   1,007.30x = 1,264,330.32
5. Step 5: Solve for x
   x = 1,264,330.32/1,007.30
6. Step 6: Final answer
   x = 1,255.16