Finding the Fourth Proportional to 12,312.31, 18,468.34 and 3,078.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,312.31 : 18,468.34 = 3,078.31 : x
2. Step 2: Convert to fraction form
   12,312.31/18,468.34 = 3,078.31/x
3. Step 3: Cross multiply
   12,312.31x = 18,468.34 × 3,078.31
4. Step 4: Simplify right side
   12,312.31x = 56,851,275.71
5. Step 5: Solve for x
   x = 56,851,275.71/12,312.31
6. Step 6: Final answer
   x = 4,617.43