Finding the Fourth Proportional to 3,978,561, 5,490,414.18 and 2,167,725

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978,561 : 5,490,414.18 = 2,167,725 : x
2. Step 2: Convert to fraction form
   3,978,561/5,490,414.18 = 2,167,725/x
3. Step 3: Cross multiply
   3,978,561x = 5,490,414.18 × 2,167,725
4. Step 4: Simplify right side
   3,978,561x = 11,901,708,078,340.50
5. Step 5: Solve for x
   x = 11,901,708,078,340.50/3,978,561
6. Step 6: Final answer
   x = 2,991,460.50