Finding the Fourth Proportional to 12,427.31, 18,642.78 and 7,743.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,427.31 : 18,642.78 = 7,743.48 : x
2. Step 2: Convert to fraction form
   12,427.31/18,642.78 = 7,743.48/x
3. Step 3: Cross multiply
   12,427.31x = 18,642.78 × 7,743.48
4. Step 4: Simplify right side
   12,427.31x = 144,359,994.07
5. Step 5: Solve for x
   x = 144,359,994.07/12,427.31
6. Step 6: Final answer
   x = 11,616.36