Finding the Fourth Proportional to 21,796,720.50, 30,080,407.42 and 12,138,928.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,796,720.50 : 30,080,407.42 = 12,138,928.50 : x
2. Step 2: Convert to fraction form
   21,796,720.50/30,080,407.42 = 12,138,928.50/x
3. Step 3: Cross multiply
   21,796,720.50x = 30,080,407.42 × 12,138,928.50
4. Step 4: Simplify right side
   21,796,720.50x = 365,143,914,922,249.50
5. Step 5: Solve for x
   x = 365,143,914,922,249.50/21,796,720.50
6. Step 6: Final answer
   x = 16,752,241.00