Finding the Fourth Proportional to 2,158,436.80, 2,978,647.12 and 1,191,568.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158,436.80 : 2,978,647.12 = 1,191,568.40 : x
2. Step 2: Convert to fraction form
   2,158,436.80/2,978,647.12 = 1,191,568.40/x
3. Step 3: Cross multiply
   2,158,436.80x = 2,978,647.12 × 1,191,568.40
4. Step 4: Simplify right side
   2,158,436.80x = 3,549,261,782,943.01
5. Step 5: Solve for x
   x = 3,549,261,782,943.01/2,158,436.80
6. Step 6: Final answer
   x = 1,644,366.79