Finding the Fourth Proportional to 14,385.39, 21,554.38 and 12,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   14,385.39 : 21,554.38 = 12,515.50 : x
2. Step 2: Convert to fraction form
   14,385.39/21,554.38 = 12,515.50/x
3. Step 3: Cross multiply
   14,385.39x = 21,554.38 × 12,515.50
4. Step 4: Simplify right side
   14,385.39x = 269,763,842.89
5. Step 5: Solve for x
   x = 269,763,842.89/14,385.39
6. Step 6: Final answer
   x = 18,752.63