Finding the Fourth Proportional to 30,639, 42,285.46 and 17,210.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,639 : 42,285.46 = 17,210.28 : x
2. Step 2: Convert to fraction form
   30,639/42,285.46 = 17,210.28/x
3. Step 3: Cross multiply
   30,639x = 42,285.46 × 17,210.28
4. Step 4: Simplify right side
   30,639x = 727,744,606.53
5. Step 5: Solve for x
   x = 727,744,606.53/30,639
6. Step 6: Final answer
   x = 23,752.23