Finding the Fourth Proportional to 2,158,439.76, 2,978,651.28 and 1,191,571.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158,439.76 : 2,978,651.28 = 1,191,571.38 : x
2. Step 2: Convert to fraction form
   2,158,439.76/2,978,651.28 = 1,191,571.38/x
3. Step 3: Cross multiply
   2,158,439.76x = 2,978,651.28 × 1,191,571.38
4. Step 4: Simplify right side
   2,158,439.76x = 3,549,275,616,248.37
5. Step 5: Solve for x
   x = 3,549,275,616,248.37/2,158,439.76
6. Step 6: Final answer
   x = 1,644,370.94