Finding the Fourth Proportional to 2,138,406.86, 3,208,200.78 and 859,405.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138,406.86 : 3,208,200.78 = 859,405.52 : x
2. Step 2: Convert to fraction form
   2,138,406.86/3,208,200.78 = 859,405.52/x
3. Step 3: Cross multiply
   2,138,406.86x = 3,208,200.78 × 859,405.52
4. Step 4: Simplify right side
   2,138,406.86x = 2,757,145,459,600.31
5. Step 5: Solve for x
   x = 2,757,145,459,600.31/2,138,406.86
6. Step 6: Final answer
   x = 1,289,345.59