Finding the Fourth Proportional to 12,100.78, 18,153.30 and 4,309.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.78 : 18,153.30 = 4,309.60 : x
2. Step 2: Convert to fraction form
   12,100.78/18,153.30 = 4,309.60/x
3. Step 3: Cross multiply
   12,100.78x = 18,153.30 × 4,309.60
4. Step 4: Simplify right side
   12,100.78x = 78,233,461.68
5. Step 5: Solve for x
   x = 78,233,461.68/12,100.78
6. Step 6: Final answer
   x = 6,465.16