Finding the Fourth Proportional to 42,015.24, 63,000.99 and 12,429.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42,015.24 : 63,000.99 = 12,429.18 : x
2. Step 2: Convert to fraction form
   42,015.24/63,000.99 = 12,429.18/x
3. Step 3: Cross multiply
   42,015.24x = 63,000.99 × 12,429.18
4. Step 4: Simplify right side
   42,015.24x = 783,050,644.89
5. Step 5: Solve for x
   x = 783,050,644.89/42,015.24
6. Step 6: Final answer
   x = 18,637.30