Finding the Fourth Proportional to 12,808.31, 19,215.31 and 3,924.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.31 : 19,215.31 = 3,924.87 : x
2. Step 2: Convert to fraction form
   12,808.31/19,215.31 = 3,924.87/x
3. Step 3: Cross multiply
   12,808.31x = 19,215.31 × 3,924.87
4. Step 4: Simplify right side
   12,808.31x = 75,417,627.34
5. Step 5: Solve for x
   x = 75,417,627.34/12,808.31
6. Step 6: Final answer
   x = 5,888.18