Finding the Fourth Proportional to 2,160,078.96, 2,980,785.60 and 1,289,895.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,160,078.96 : 2,980,785.60 = 1,289,895.72 : x
2. Step 2: Convert to fraction form
   2,160,078.96/2,980,785.60 = 1,289,895.72/x
3. Step 3: Cross multiply
   2,160,078.96x = 2,980,785.60 × 1,289,895.72
4. Step 4: Simplify right side
   2,160,078.96x = 3,844,902,587,677.63
5. Step 5: Solve for x
   x = 3,844,902,587,677.63/2,160,078.96
6. Step 6: Final answer
   x = 1,779,982.43