Finding the Fourth Proportional to 42,002.37, 63,015.86 and 12,420.97

Step by Step Solution

1. Step 1: Write the proportion equation
   42,002.37 : 63,015.86 = 12,420.97 : x
2. Step 2: Convert to fraction form
   42,002.37/63,015.86 = 12,420.97/x
3. Step 3: Cross multiply
   42,002.37x = 63,015.86 × 12,420.97
4. Step 4: Simplify right side
   42,002.37x = 782,718,106.58
5. Step 5: Solve for x
   x = 782,718,106.58/42,002.37
6. Step 6: Final answer
   x = 18,635.09