Finding the Fourth Proportional to 30,621.72, 42,259.56 and 17,192.28

Step by Step Solution

1. Step 1: Write the proportion equation
   30,621.72 : 42,259.56 = 17,192.28 : x
2. Step 2: Convert to fraction form
   30,621.72/42,259.56 = 17,192.28/x
3. Step 3: Cross multiply
   30,621.72x = 42,259.56 × 17,192.28
4. Step 4: Simplify right side
   30,621.72x = 726,538,188.20
5. Step 5: Solve for x
   x = 726,538,188.20/30,621.72
6. Step 6: Final answer
   x = 23,726.24