Finding the Fourth Proportional to 12,288.94, 18,428.72 and 4,389.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,288.94 : 18,428.72 = 4,389.98 : x
2. Step 2: Convert to fraction form
   12,288.94/18,428.72 = 4,389.98/x
3. Step 3: Cross multiply
   12,288.94x = 18,428.72 × 4,389.98
4. Step 4: Simplify right side
   12,288.94x = 80,901,598.13
5. Step 5: Solve for x
   x = 80,901,598.13/12,288.94
6. Step 6: Final answer
   x = 6,583.29