Finding the Fourth Proportional to 12,300.90, 18,447.24 and 3,978.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.90 : 18,447.24 = 3,978.69 : x
2. Step 2: Convert to fraction form
   12,300.90/18,447.24 = 3,978.69/x
3. Step 3: Cross multiply
   12,300.90x = 18,447.24 × 3,978.69
4. Step 4: Simplify right side
   12,300.90x = 73,395,849.32
5. Step 5: Solve for x
   x = 73,395,849.32/12,300.90
6. Step 6: Final answer
   x = 5,966.71