Finding the Fourth Proportional to 21,100.62, 29,121.62 and 12,148.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.62 : 29,121.62 = 12,148.50 : x
2. Step 2: Convert to fraction form
   21,100.62/29,121.62 = 12,148.50/x
3. Step 3: Cross multiply
   21,100.62x = 29,121.62 × 12,148.50
4. Step 4: Simplify right side
   21,100.62x = 353,783,939.83
5. Step 5: Solve for x
   x = 353,783,939.83/21,100.62
6. Step 6: Final answer
   x = 16,766.52