Finding the Fourth Proportional to 2,309,086.48, 3,186,543.96 and 1,290,491.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309,086.48 : 3,186,543.96 = 1,290,491.20 : x
2. Step 2: Convert to fraction form
   2,309,086.48/3,186,543.96 = 1,290,491.20/x
3. Step 3: Cross multiply
   2,309,086.48x = 3,186,543.96 × 1,290,491.20
4. Step 4: Simplify right side
   2,309,086.48x = 4,112,206,938,793.15
5. Step 5: Solve for x
   x = 4,112,206,938,793.15/2,309,086.48
6. Step 6: Final answer
   x = 1,780,880.44