Finding the Fourth Proportional to 8,870.38, 12,242.55 and 5,285.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.38 : 12,242.55 = 5,285.50 : x
2. Step 2: Convert to fraction form
   8,870.38/12,242.55 = 5,285.50/x
3. Step 3: Cross multiply
   8,870.38x = 12,242.55 × 5,285.50
4. Step 4: Simplify right side
   8,870.38x = 64,707,998.03
5. Step 5: Solve for x
   x = 64,707,998.03/8,870.38
6. Step 6: Final answer
   x = 7,294.84