Finding the Fourth Proportional to 2,140,066.72, 3,209,166.86 and 809,437.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140,066.72 : 3,209,166.86 = 809,437.60 : x
2. Step 2: Convert to fraction form
   2,140,066.72/3,209,166.86 = 809,437.60/x
3. Step 3: Cross multiply
   2,140,066.72x = 3,209,166.86 × 809,437.60
4. Step 4: Simplify right side
   2,140,066.72x = 2,597,620,321,157.94
5. Step 5: Solve for x
   x = 2,597,620,321,157.94/2,140,066.72
6. Step 6: Final answer
   x = 1,213,803.43