Finding the Fourth Proportional to 8,978.03, 12,390.02 and 4,945.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.03 : 12,390.02 = 4,945.03 : x
2. Step 2: Convert to fraction form
   8,978.03/12,390.02 = 4,945.03/x
3. Step 3: Cross multiply
   8,978.03x = 12,390.02 × 4,945.03
4. Step 4: Simplify right side
   8,978.03x = 61,269,029.91
5. Step 5: Solve for x
   x = 61,269,029.91/8,978.03
6. Step 6: Final answer
   x = 6,824.33