Finding the Fourth Proportional to 2,155,412.76, 3,231,365.76 and 806,820

Step by Step Solution

1. Step 1: Write the proportion equation
   2,155,412.76 : 3,231,365.76 = 806,820 : x
2. Step 2: Convert to fraction form
   2,155,412.76/3,231,365.76 = 806,820/x
3. Step 3: Cross multiply
   2,155,412.76x = 3,231,365.76 × 806,820
4. Step 4: Simplify right side
   2,155,412.76x = 2,607,130,522,483.20
5. Step 5: Solve for x
   x = 2,607,130,522,483.20/2,155,412.76
6. Step 6: Final answer
   x = 1,209,573.67