Finding the Fourth Proportional to 8,978.04, 12,390.38 and 5,202.23

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.04 : 12,390.38 = 5,202.23 : x
2. Step 2: Convert to fraction form
   8,978.04/12,390.38 = 5,202.23/x
3. Step 3: Cross multiply
   8,978.04x = 12,390.38 × 5,202.23
4. Step 4: Simplify right side
   8,978.04x = 64,457,518.58
5. Step 5: Solve for x
   x = 64,457,518.58/8,978.04
6. Step 6: Final answer
   x = 7,179.46