Finding the Fourth Proportional to 21,071.49, 29,077.88 and 12,118.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,071.49 : 29,077.88 = 12,118.43 : x
2. Step 2: Convert to fraction form
   21,071.49/29,077.88 = 12,118.43/x
3. Step 3: Cross multiply
   21,071.49x = 29,077.88 × 12,118.43
4. Step 4: Simplify right side
   21,071.49x = 352,378,047.35
5. Step 5: Solve for x
   x = 352,378,047.35/21,071.49
6. Step 6: Final answer
   x = 16,722.98