Finding the Fourth Proportional to 21,501.86, 29,672.12 and 12,070.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,501.86 : 29,672.12 = 12,070.42 : x
2. Step 2: Convert to fraction form
   21,501.86/29,672.12 = 12,070.42/x
3. Step 3: Cross multiply
   21,501.86x = 29,672.12 × 12,070.42
4. Step 4: Simplify right side
   21,501.86x = 358,154,906.69
5. Step 5: Solve for x
   x = 358,154,906.69/21,501.86
6. Step 6: Final answer
   x = 16,656.93