Finding the Fourth Proportional to 12,078.60, 18,117.72 and 3,313.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,078.60 : 18,117.72 = 3,313.50 : x
2. Step 2: Convert to fraction form
   12,078.60/18,117.72 = 3,313.50/x
3. Step 3: Cross multiply
   12,078.60x = 18,117.72 × 3,313.50
4. Step 4: Simplify right side
   12,078.60x = 60,033,065.22
5. Step 5: Solve for x
   x = 60,033,065.22/12,078.60
6. Step 6: Final answer
   x = 4,970.20