Finding the Fourth Proportional to 2,658,869.64, 3,987,467.88 and 861,336.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658,869.64 : 3,987,467.88 = 861,336.12 : x
2. Step 2: Convert to fraction form
   2,658,869.64/3,987,467.88 = 861,336.12/x
3. Step 3: Cross multiply
   2,658,869.64x = 3,987,467.88 × 861,336.12
4. Step 4: Simplify right side
   2,658,869.64x = 3,434,550,112,383.83
5. Step 5: Solve for x
   x = 3,434,550,112,383.83/2,658,869.64
6. Step 6: Final answer
   x = 1,291,733.17