Finding the Fourth Proportional to 1,265.38, 1,899.04 and 878.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,265.38 : 1,899.04 = 878.10 : x
2. Step 2: Convert to fraction form
   1,265.38/1,899.04 = 878.10/x
3. Step 3: Cross multiply
   1,265.38x = 1,899.04 × 878.10
4. Step 4: Simplify right side
   1,265.38x = 1,667,539.72
5. Step 5: Solve for x
   x = 1,667,539.72/1,265.38
6. Step 6: Final answer
   x = 1,317.82