Finding the Fourth Proportional to 12,912.48, 19,383.84 and 12,386.88

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.48 : 19,383.84 = 12,386.88 : x
2. Step 2: Convert to fraction form
   12,912.48/19,383.84 = 12,386.88/x
3. Step 3: Cross multiply
   12,912.48x = 19,383.84 × 12,386.88
4. Step 4: Simplify right side
   12,912.48x = 240,105,300.02
5. Step 5: Solve for x
   x = 240,105,300.02/12,912.48
6. Step 6: Final answer
   x = 18,594.82