Finding the Fourth Proportional to 12,585,648.20, 18,878,418.42 and 3,487,719.80

Step by Step Solution

1. Step 1: Write the proportion equation
   12,585,648.20 : 18,878,418.42 = 3,487,719.80 : x
2. Step 2: Convert to fraction form
   12,585,648.20/18,878,418.42 = 3,487,719.80/x
3. Step 3: Cross multiply
   12,585,648.20x = 18,878,418.42 × 3,487,719.80
4. Step 4: Simplify right side
   12,585,648.20x = 65,842,633,716,118.72
5. Step 5: Solve for x
   x = 65,842,633,716,118.72/12,585,648.20
6. Step 6: Final answer
   x = 5,231,564.77