Finding the Fourth Proportional to 21,069.89, 29,077.33 and 12,117.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,069.89 : 29,077.33 = 12,117.40 : x
2. Step 2: Convert to fraction form
   21,069.89/29,077.33 = 12,117.40/x
3. Step 3: Cross multiply
   21,069.89x = 29,077.33 × 12,117.40
4. Step 4: Simplify right side
   21,069.89x = 352,341,591.22
5. Step 5: Solve for x
   x = 352,341,591.22/21,069.89
6. Step 6: Final answer
   x = 16,722.52