Finding the Fourth Proportional to 28,215.63, 42,320.07 and 8,494.29

Step by Step Solution

1. Step 1: Write the proportion equation
   28,215.63 : 42,320.07 = 8,494.29 : x
2. Step 2: Convert to fraction form
   28,215.63/42,320.07 = 8,494.29/x
3. Step 3: Cross multiply
   28,215.63x = 42,320.07 × 8,494.29
4. Step 4: Simplify right side
   28,215.63x = 359,478,947.40
5. Step 5: Solve for x
   x = 359,478,947.40/28,215.63
6. Step 6: Final answer
   x = 12,740.42