Finding the Fourth Proportional to 25,009.74, 34,512.84 and 13,679.31

Step by Step Solution

1. Step 1: Write the proportion equation
   25,009.74 : 34,512.84 = 13,679.31 : x
2. Step 2: Convert to fraction form
   25,009.74/34,512.84 = 13,679.31/x
3. Step 3: Cross multiply
   25,009.74x = 34,512.84 × 13,679.31
4. Step 4: Simplify right side
   25,009.74x = 472,111,837.34
5. Step 5: Solve for x
   x = 472,111,837.34/25,009.74
6. Step 6: Final answer
   x = 18,877.12