Finding the Fourth Proportional to 12,312.56, 18,468.72 and 3,078.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,312.56 : 18,468.72 = 3,078.56 : x
2. Step 2: Convert to fraction form
   12,312.56/18,468.72 = 3,078.56/x
3. Step 3: Cross multiply
   12,312.56x = 18,468.72 × 3,078.56
4. Step 4: Simplify right side
   12,312.56x = 56,857,062.64
5. Step 5: Solve for x
   x = 56,857,062.64/12,312.56
6. Step 6: Final answer
   x = 4,617.81