Finding the Fourth Proportional to 14,437, 21,618.78 and 13,105.72

Step by Step Solution

1. Step 1: Write the proportion equation
   14,437 : 21,618.78 = 13,105.72 : x
2. Step 2: Convert to fraction form
   14,437/21,618.78 = 13,105.72/x
3. Step 3: Cross multiply
   14,437x = 21,618.78 × 13,105.72
4. Step 4: Simplify right side
   14,437x = 283,329,677.42
5. Step 5: Solve for x
   x = 283,329,677.42/14,437
6. Step 6: Final answer
   x = 19,625.25