Finding the Fourth Proportional to 38,986.86, 53,801.89 and 21,081.87

Step by Step Solution

1. Step 1: Write the proportion equation
   38,986.86 : 53,801.89 = 21,081.87 : x
2. Step 2: Convert to fraction form
   38,986.86/53,801.89 = 21,081.87/x
3. Step 3: Cross multiply
   38,986.86x = 53,801.89 × 21,081.87
4. Step 4: Simplify right side
   38,986.86x = 1,134,244,450.73
5. Step 5: Solve for x
   x = 1,134,244,450.73/38,986.86
6. Step 6: Final answer
   x = 29,092.99