Finding the Fourth Proportional to 22,710,578.28, 31,340,193.30 and 12,920,811.72

Step by Step Solution

1. Step 1: Write the proportion equation
   22,710,578.28 : 31,340,193.30 = 12,920,811.72 : x
2. Step 2: Convert to fraction form
   22,710,578.28/31,340,193.30 = 12,920,811.72/x
3. Step 3: Cross multiply
   22,710,578.28x = 31,340,193.30 × 12,920,811.72
4. Step 4: Simplify right side
   22,710,578.28x = 404,940,736,897,705.50
5. Step 5: Solve for x
   x = 404,940,736,897,705.50/22,710,578.28
6. Step 6: Final answer
   x = 17,830,489.91