Finding the Fourth Proportional to 21,630.58, 29,849.55 and 12,070.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,630.58 : 29,849.55 = 12,070.72 : x
2. Step 2: Convert to fraction form
   21,630.58/29,849.55 = 12,070.72/x
3. Step 3: Cross multiply
   21,630.58x = 29,849.55 × 12,070.72
4. Step 4: Simplify right side
   21,630.58x = 360,305,560.18
5. Step 5: Solve for x
   x = 360,305,560.18/21,630.58
6. Step 6: Final answer
   x = 16,657.23