Finding the Fourth Proportional to 21,061.32, 29,066.15 and 12,111.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.32 : 29,066.15 = 12,111.63 : x
2. Step 2: Convert to fraction form
   21,061.32/29,066.15 = 12,111.63/x
3. Step 3: Cross multiply
   21,061.32x = 29,066.15 × 12,111.63
4. Step 4: Simplify right side
   21,061.32x = 352,038,484.60
5. Step 5: Solve for x
   x = 352,038,484.60/21,061.32
6. Step 6: Final answer
   x = 16,714.93