Finding the Fourth Proportional to 12,312.08, 18,443.46 and 5,729.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,312.08 : 18,443.46 = 5,729.12 : x
2. Step 2: Convert to fraction form
   12,312.08/18,443.46 = 5,729.12/x
3. Step 3: Cross multiply
   12,312.08x = 18,443.46 × 5,729.12
4. Step 4: Simplify right side
   12,312.08x = 105,664,795.56
5. Step 5: Solve for x
   x = 105,664,795.56/12,312.08
6. Step 6: Final answer
   x = 8,582.21