Finding the Fourth Proportional to 20,886.31, 31,291.71 and 13,849.57

Step by Step Solution

1. Step 1: Write the proportion equation
   20,886.31 : 31,291.71 = 13,849.57 : x
2. Step 2: Convert to fraction form
   20,886.31/31,291.71 = 13,849.57/x
3. Step 3: Cross multiply
   20,886.31x = 31,291.71 × 13,849.57
4. Step 4: Simplify right side
   20,886.31x = 433,376,728.06
5. Step 5: Solve for x
   x = 433,376,728.06/20,886.31
6. Step 6: Final answer
   x = 20,749.32