Finding the Fourth Proportional to 42,131.25, 63,215.33 and 19,960.47

Step by Step Solution

1. Step 1: Write the proportion equation
   42,131.25 : 63,215.33 = 19,960.47 : x
2. Step 2: Convert to fraction form
   42,131.25/63,215.33 = 19,960.47/x
3. Step 3: Cross multiply
   42,131.25x = 63,215.33 × 19,960.47
4. Step 4: Simplify right side
   42,131.25x = 1,261,807,598.20
5. Step 5: Solve for x
   x = 1,261,807,598.20/42,131.25
6. Step 6: Final answer
   x = 29,949.45