Finding the Fourth Proportional to 12,111.63, 18,168.99 and 4,320.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.63 : 18,168.99 = 4,320.51 : x
2. Step 2: Convert to fraction form
   12,111.63/18,168.99 = 4,320.51/x
3. Step 3: Cross multiply
   12,111.63x = 18,168.99 × 4,320.51
4. Step 4: Simplify right side
   12,111.63x = 78,499,302.98
5. Step 5: Solve for x
   x = 78,499,302.98/12,111.63
6. Step 6: Final answer
   x = 6,481.32