Finding the Fourth Proportional to 21,651,259.98, 29,878,728.43 and 12,949,432.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,651,259.98 : 29,878,728.43 = 12,949,432.42 : x
2. Step 2: Convert to fraction form
   21,651,259.98/29,878,728.43 = 12,949,432.42/x
3. Step 3: Cross multiply
   21,651,259.98x = 29,878,728.43 × 12,949,432.42
4. Step 4: Simplify right side
   21,651,259.98x = 386,912,574,599,817.69
5. Step 5: Solve for x
   x = 386,912,574,599,817.69/21,651,259.98
6. Step 6: Final answer
   x = 17,870,210.55