Finding the Fourth Proportional to 12,418.82, 18,646.45 and 7,758.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,418.82 : 18,646.45 = 7,758.69 : x
2. Step 2: Convert to fraction form
   12,418.82/18,646.45 = 7,758.69/x
3. Step 3: Cross multiply
   12,418.82x = 18,646.45 × 7,758.69
4. Step 4: Simplify right side
   12,418.82x = 144,672,025.15
5. Step 5: Solve for x
   x = 144,672,025.15/12,418.82
6. Step 6: Final answer
   x = 11,649.42