Finding the Fourth Proportional to 2,280,387.80, 3,418,443.30 and 861,397.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280,387.80 : 3,418,443.30 = 861,397.40 : x
2. Step 2: Convert to fraction form
   2,280,387.80/3,418,443.30 = 861,397.40/x
3. Step 3: Cross multiply
   2,280,387.80x = 3,418,443.30 × 861,397.40
4. Step 4: Simplify right side
   2,280,387.80x = 2,944,638,170,667.42
5. Step 5: Solve for x
   x = 2,944,638,170,667.42/2,280,387.80
6. Step 6: Final answer
   x = 1,291,288.34