Finding the Fourth Proportional to 3,686,436.56, 5,087,390.28 and 2,158,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,686,436.56 : 5,087,390.28 = 2,158,400.72 : x
2. Step 2: Convert to fraction form
   3,686,436.56/5,087,390.28 = 2,158,400.72/x
3. Step 3: Cross multiply
   3,686,436.56x = 5,087,390.28 × 2,158,400.72
4. Step 4: Simplify right side
   3,686,436.56x = 10,980,626,843,273.00
5. Step 5: Solve for x
   x = 10,980,626,843,273.00/3,686,436.56
6. Step 6: Final answer
   x = 2,978,656.13