Finding the Fourth Proportional to 21,868.75, 30,181.31 and 12,308.93

Step by Step Solution

1. Step 1: Write the proportion equation
   21,868.75 : 30,181.31 = 12,308.93 : x
2. Step 2: Convert to fraction form
   21,868.75/30,181.31 = 12,308.93/x
3. Step 3: Cross multiply
   21,868.75x = 30,181.31 × 12,308.93
4. Step 4: Simplify right side
   21,868.75x = 371,499,532.83
5. Step 5: Solve for x
   x = 371,499,532.83/21,868.75
6. Step 6: Final answer
   x = 16,987.69