Finding the Fourth Proportional to 21,499,172.28, 29,671,786.40 and 12,681,114.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,499,172.28 : 29,671,786.40 = 12,681,114.48 : x
2. Step 2: Convert to fraction form
   21,499,172.28/29,671,786.40 = 12,681,114.48/x
3. Step 3: Cross multiply
   21,499,172.28x = 29,671,786.40 × 12,681,114.48
4. Step 4: Simplify right side
   21,499,172.28x = 376,271,320,101,101.50
5. Step 5: Solve for x
   x = 376,271,320,101,101.50/21,499,172.28
6. Step 6: Final answer
   x = 17,501,665.42