Finding the Fourth Proportional to 7,728,639.89, 10,665,106.72 and 4,290,659.49

Step by Step Solution

1. Step 1: Write the proportion equation
   7,728,639.89 : 10,665,106.72 = 4,290,659.49 : x
2. Step 2: Convert to fraction form
   7,728,639.89/10,665,106.72 = 4,290,659.49/x
3. Step 3: Cross multiply
   7,728,639.89x = 10,665,106.72 × 4,290,659.49
4. Step 4: Simplify right side
   7,728,639.89x = 45,760,341,360,030.78
5. Step 5: Solve for x
   x = 45,760,341,360,030.78/7,728,639.89
6. Step 6: Final answer
   x = 5,920,878.97