Finding the Fourth Proportional to 42,022.50, 63,033.68 and 12,438

Step by Step Solution

1. Step 1: Write the proportion equation
   42,022.50 : 63,033.68 = 12,438 : x
2. Step 2: Convert to fraction form
   42,022.50/63,033.68 = 12,438/x
3. Step 3: Cross multiply
   42,022.50x = 63,033.68 × 12,438
4. Step 4: Simplify right side
   42,022.50x = 784,012,911.84
5. Step 5: Solve for x
   x = 784,012,911.84/42,022.50
6. Step 6: Final answer
   x = 18,656.98