Finding the Fourth Proportional to 42,687.97, 63,978.12 and 21,633.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,687.97 : 63,978.12 = 21,633.30 : x
2. Step 2: Convert to fraction form
   42,687.97/63,978.12 = 21,633.30/x
3. Step 3: Cross multiply
   42,687.97x = 63,978.12 × 21,633.30
4. Step 4: Simplify right side
   42,687.97x = 1,384,057,863.40
5. Step 5: Solve for x
   x = 1,384,057,863.40/42,687.97
6. Step 6: Final answer
   x = 32,422.67