Finding the Fourth Proportional to 42,005.99, 62,987.12 and 12,419.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,005.99 : 62,987.12 = 12,419.83 : x
2. Step 2: Convert to fraction form
   42,005.99/62,987.12 = 12,419.83/x
3. Step 3: Cross multiply
   42,005.99x = 62,987.12 × 12,419.83
4. Step 4: Simplify right side
   42,005.99x = 782,289,385.80
5. Step 5: Solve for x
   x = 782,289,385.80/42,005.99
6. Step 6: Final answer
   x = 18,623.28