Finding the Fourth Proportional to 1,016.83, 1,515.12 and 907.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.83 : 1,515.12 = 907.79 : x
2. Step 2: Convert to fraction form
   1,016.83/1,515.12 = 907.79/x
3. Step 3: Cross multiply
   1,016.83x = 1,515.12 × 907.79
4. Step 4: Simplify right side
   1,016.83x = 1,375,410.78
5. Step 5: Solve for x
   x = 1,375,410.78/1,016.83
6. Step 6: Final answer
   x = 1,352.65