Finding the Fourth Proportional to 21,290,105.24, 29,393,365.02 and 13,854,851.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,290,105.24 : 29,393,365.02 = 13,854,851.72 : x
2. Step 2: Convert to fraction form
   21,290,105.24/29,393,365.02 = 13,854,851.72/x
3. Step 3: Cross multiply
   21,290,105.24x = 29,393,365.02 × 13,854,851.72
4. Step 4: Simplify right side
   21,290,105.24x = 407,240,713,903,934.88
5. Step 5: Solve for x
   x = 407,240,713,903,934.88/21,290,105.24
6. Step 6: Final answer
   x = 19,128,168.19