Finding the Fourth Proportional to 42,005.21, 63,019.29 and 12,423.02

Step by Step Solution

1. Step 1: Write the proportion equation
   42,005.21 : 63,019.29 = 12,423.02 : x
2. Step 2: Convert to fraction form
   42,005.21/63,019.29 = 12,423.02/x
3. Step 3: Cross multiply
   42,005.21x = 63,019.29 × 12,423.02
4. Step 4: Simplify right side
   42,005.21x = 782,889,900.06
5. Step 5: Solve for x
   x = 782,889,900.06/42,005.21
6. Step 6: Final answer
   x = 18,637.92