Finding the Fourth Proportional to 42,003.84, 63,019.13 and 12,421.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,003.84 : 63,019.13 = 12,421.83 : x
2. Step 2: Convert to fraction form
   42,003.84/63,019.13 = 12,421.83/x
3. Step 3: Cross multiply
   42,003.84x = 63,019.13 × 12,421.83
4. Step 4: Simplify right side
   42,003.84x = 782,812,857.50
5. Step 5: Solve for x
   x = 782,812,857.50/42,003.84
6. Step 6: Final answer
   x = 18,636.70