Finding the Fourth Proportional to 28,019.57, 42,029.48 and 8,298.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,019.57 : 42,029.48 = 8,298.50 : x
2. Step 2: Convert to fraction form
   28,019.57/42,029.48 = 8,298.50/x
3. Step 3: Cross multiply
   28,019.57x = 42,029.48 × 8,298.50
4. Step 4: Simplify right side
   28,019.57x = 348,781,450.38
5. Step 5: Solve for x
   x = 348,781,450.38/28,019.57
6. Step 6: Final answer
   x = 12,447.78