Finding the Fourth Proportional to 21,520.14, 29,698.56 and 12,088.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,520.14 : 29,698.56 = 12,088.50 : x
2. Step 2: Convert to fraction form
   21,520.14/29,698.56 = 12,088.50/x
3. Step 3: Cross multiply
   21,520.14x = 29,698.56 × 12,088.50
4. Step 4: Simplify right side
   21,520.14x = 359,011,042.56
5. Step 5: Solve for x
   x = 359,011,042.56/21,520.14
6. Step 6: Final answer
   x = 16,682.56