Finding the Fourth Proportional to 42,140.43, 63,219.83 and 12,154.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,140.43 : 63,219.83 = 12,154.50 : x
2. Step 2: Convert to fraction form
   42,140.43/63,219.83 = 12,154.50/x
3. Step 3: Cross multiply
   42,140.43x = 63,219.83 × 12,154.50
4. Step 4: Simplify right side
   42,140.43x = 768,405,362.96
5. Step 5: Solve for x
   x = 768,405,362.96/42,140.43
6. Step 6: Final answer
   x = 18,234.40