Finding the Fourth Proportional to 20,383,648.47, 28,118,715.50 and 12,117,831.05

Step by Step Solution

1. Step 1: Write the proportion equation
   20,383,648.47 : 28,118,715.50 = 12,117,831.05 : x
2. Step 2: Convert to fraction form
   20,383,648.47/28,118,715.50 = 12,117,831.05/x
3. Step 3: Cross multiply
   20,383,648.47x = 28,118,715.50 × 12,117,831.05
4. Step 4: Simplify right side
   20,383,648.47x = 340,737,843,872,607.69
5. Step 5: Solve for x
   x = 340,737,843,872,607.69/20,383,648.47
6. Step 6: Final answer
   x = 16,716,234.31