Finding the Fourth Proportional to 21,398.72, 32,081.67 and 13,077.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,398.72 : 32,081.67 = 13,077.18 : x
2. Step 2: Convert to fraction form
   21,398.72/32,081.67 = 13,077.18/x
3. Step 3: Cross multiply
   21,398.72x = 32,081.67 × 13,077.18
4. Step 4: Simplify right side
   21,398.72x = 419,537,773.29
5. Step 5: Solve for x
   x = 419,537,773.29/21,398.72
6. Step 6: Final answer
   x = 19,605.75