Finding the Fourth Proportional to 12,642.30, 18,967.53 and 3,878.94

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.30 : 18,967.53 = 3,878.94 : x
2. Step 2: Convert to fraction form
   12,642.30/18,967.53 = 3,878.94/x
3. Step 3: Cross multiply
   12,642.30x = 18,967.53 × 3,878.94
4. Step 4: Simplify right side
   12,642.30x = 73,573,910.82
5. Step 5: Solve for x
   x = 73,573,910.82/12,642.30
6. Step 6: Final answer
   x = 5,819.66