Finding the Fourth Proportional to 13,799,085.89, 20,675,746.61 and 8,391,378.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,799,085.89 : 20,675,746.61 = 8,391,378.47 : x
2. Step 2: Convert to fraction form
   13,799,085.89/20,675,746.61 = 8,391,378.47/x
3. Step 3: Cross multiply
   13,799,085.89x = 20,675,746.61 × 8,391,378.47
4. Step 4: Simplify right side
   13,799,085.89x = 173,498,014,964,061.97
5. Step 5: Solve for x
   x = 173,498,014,964,061.97/13,799,085.89
6. Step 6: Final answer
   x = 12,573,152.77