Finding the Fourth Proportional to 42,005.22, 63,019.30 and 12,423.02

Step by Step Solution

1. Step 1: Write the proportion equation
   42,005.22 : 63,019.30 = 12,423.02 : x
2. Step 2: Convert to fraction form
   42,005.22/63,019.30 = 12,423.02/x
3. Step 3: Cross multiply
   42,005.22x = 63,019.30 × 12,423.02
4. Step 4: Simplify right side
   42,005.22x = 782,890,024.29
5. Step 5: Solve for x
   x = 782,890,024.29/42,005.22
6. Step 6: Final answer
   x = 18,637.92