Finding the Fourth Proportional to 42,663.80, 63,968.22 and 17,721.02

Step by Step Solution

1. Step 1: Write the proportion equation
   42,663.80 : 63,968.22 = 17,721.02 : x
2. Step 2: Convert to fraction form
   42,663.80/63,968.22 = 17,721.02/x
3. Step 3: Cross multiply
   42,663.80x = 63,968.22 × 17,721.02
4. Step 4: Simplify right side
   42,663.80x = 1,133,582,105.98
5. Step 5: Solve for x
   x = 1,133,582,105.98/42,663.80
6. Step 6: Final answer
   x = 26,570.12