Finding the Fourth Proportional to 21,607.43, 29,820.80 and 12,048.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,607.43 : 29,820.80 = 12,048.86 : x
2. Step 2: Convert to fraction form
   21,607.43/29,820.80 = 12,048.86/x
3. Step 3: Cross multiply
   21,607.43x = 29,820.80 × 12,048.86
4. Step 4: Simplify right side
   21,607.43x = 359,306,748.96
5. Step 5: Solve for x
   x = 359,306,748.96/21,607.43
6. Step 6: Final answer
   x = 16,628.86