Finding the Fourth Proportional to 25,368.89, 38,021.42 and 12,892.05

Step by Step Solution

1. Step 1: Write the proportion equation
   25,368.89 : 38,021.42 = 12,892.05 : x
2. Step 2: Convert to fraction form
   25,368.89/38,021.42 = 12,892.05/x
3. Step 3: Cross multiply
   25,368.89x = 38,021.42 × 12,892.05
4. Step 4: Simplify right side
   25,368.89x = 490,173,983.25
5. Step 5: Solve for x
   x = 490,173,983.25/25,368.89
6. Step 6: Final answer
   x = 19,321.86