Finding the Fourth Proportional to 12,685.78, 19,030.49 and 3,921.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,685.78 : 19,030.49 = 3,921.38 : x
2. Step 2: Convert to fraction form
   12,685.78/19,030.49 = 3,921.38/x
3. Step 3: Cross multiply
   12,685.78x = 19,030.49 × 3,921.38
4. Step 4: Simplify right side
   12,685.78x = 74,625,682.82
5. Step 5: Solve for x
   x = 74,625,682.82/12,685.78
6. Step 6: Final answer
   x = 5,882.63