Finding the Fourth Proportional to 42,480.90, 63,724.59 and 20,304.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,480.90 : 63,724.59 = 20,304.18 : x
2. Step 2: Convert to fraction form
   42,480.90/63,724.59 = 20,304.18/x
3. Step 3: Cross multiply
   42,480.90x = 63,724.59 × 20,304.18
4. Step 4: Simplify right side
   42,480.90x = 1,293,875,545.79
5. Step 5: Solve for x
   x = 1,293,875,545.79/42,480.90
6. Step 6: Final answer
   x = 30,457.82