Finding the Fourth Proportional to 21,007.50, 28,994.61 and 12,061.17

Step by Step Solution

1. Step 1: Write the proportion equation
   21,007.50 : 28,994.61 = 12,061.17 : x
2. Step 2: Convert to fraction form
   21,007.50/28,994.61 = 12,061.17/x
3. Step 3: Cross multiply
   21,007.50x = 28,994.61 × 12,061.17
4. Step 4: Simplify right side
   21,007.50x = 349,708,920.29
5. Step 5: Solve for x
   x = 349,708,920.29/21,007.50
6. Step 6: Final answer
   x = 16,646.86