Finding the Fourth Proportional to 21,818.52, 32,705.37 and 12,439.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.52 : 32,705.37 = 12,439.35 : x
2. Step 2: Convert to fraction form
   21,818.52/32,705.37 = 12,439.35/x
3. Step 3: Cross multiply
   21,818.52x = 32,705.37 × 12,439.35
4. Step 4: Simplify right side
   21,818.52x = 406,833,544.31
5. Step 5: Solve for x
   x = 406,833,544.31/21,818.52
6. Step 6: Final answer
   x = 18,646.25