Finding the Fourth Proportional to 42,014.43, 62,999.78 and 12,428.27

Step by Step Solution

1. Step 1: Write the proportion equation
   42,014.43 : 62,999.78 = 12,428.27 : x
2. Step 2: Convert to fraction form
   42,014.43/62,999.78 = 12,428.27/x
3. Step 3: Cross multiply
   42,014.43x = 62,999.78 × 12,428.27
4. Step 4: Simplify right side
   42,014.43x = 782,978,134.89
5. Step 5: Solve for x
   x = 782,978,134.89/42,014.43
6. Step 6: Final answer
   x = 18,635.93