Finding the Fourth Proportional to 21,144.55, 29,178.71 and 12,070.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.55 : 29,178.71 = 12,070.37 : x
2. Step 2: Convert to fraction form
   21,144.55/29,178.71 = 12,070.37/x
3. Step 3: Cross multiply
   21,144.55x = 29,178.71 × 12,070.37
4. Step 4: Simplify right side
   21,144.55x = 352,197,765.47
5. Step 5: Solve for x
   x = 352,197,765.47/21,144.55
6. Step 6: Final answer
   x = 16,656.67