Finding the Fourth Proportional to 42,138.18, 63,216.45 and 12,152.25

Step by Step Solution

1. Step 1: Write the proportion equation
   42,138.18 : 63,216.45 = 12,152.25 : x
2. Step 2: Convert to fraction form
   42,138.18/63,216.45 = 12,152.25/x
3. Step 3: Cross multiply
   42,138.18x = 63,216.45 × 12,152.25
4. Step 4: Simplify right side
   42,138.18x = 768,222,104.51
5. Step 5: Solve for x
   x = 768,222,104.51/42,138.18
6. Step 6: Final answer
   x = 18,231.02