Finding the Fourth Proportional to 12,219.89, 18,335.31 and 7,025.77

Step by Step Solution

1. Step 1: Write the proportion equation
   12,219.89 : 18,335.31 = 7,025.77 : x
2. Step 2: Convert to fraction form
   12,219.89/18,335.31 = 7,025.77/x
3. Step 3: Cross multiply
   12,219.89x = 18,335.31 × 7,025.77
4. Step 4: Simplify right side
   12,219.89x = 128,819,579.26
5. Step 5: Solve for x
   x = 128,819,579.26/12,219.89
6. Step 6: Final answer
   x = 10,541.80