Finding the Fourth Proportional to 8,321.86, 12,478.47 and 4,618.54

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.86 : 12,478.47 = 4,618.54 : x
2. Step 2: Convert to fraction form
   8,321.86/12,478.47 = 4,618.54/x
3. Step 3: Cross multiply
   8,321.86x = 12,478.47 × 4,618.54
4. Step 4: Simplify right side
   8,321.86x = 57,632,312.83
5. Step 5: Solve for x
   x = 57,632,312.83/8,321.86
6. Step 6: Final answer
   x = 6,925.41