Finding the Fourth Proportional to 2,187,978.19, 3,019,561.41 and 1,221,296.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,187,978.19 : 3,019,561.41 = 1,221,296.65 : x
2. Step 2: Convert to fraction form
   2,187,978.19/3,019,561.41 = 1,221,296.65/x
3. Step 3: Cross multiply
   2,187,978.19x = 3,019,561.41 × 1,221,296.65
4. Step 4: Simplify right side
   2,187,978.19x = 3,687,780,234,502.28
5. Step 5: Solve for x
   x = 3,687,780,234,502.28/2,187,978.19
6. Step 6: Final answer
   x = 1,685,473.95