Finding the Fourth Proportional to 42,447.83, 63,679.43 and 13,986.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,447.83 : 63,679.43 = 13,986.30 : x
2. Step 2: Convert to fraction form
   42,447.83/63,679.43 = 13,986.30/x
3. Step 3: Cross multiply
   42,447.83x = 63,679.43 × 13,986.30
4. Step 4: Simplify right side
   42,447.83x = 890,639,576.84
5. Step 5: Solve for x
   x = 890,639,576.84/42,447.83
6. Step 6: Final answer
   x = 20,981.98