Finding the Fourth Proportional to 42,072.46, 63,109.60 and 12,492.38

Step by Step Solution

1. Step 1: Write the proportion equation
   42,072.46 : 63,109.60 = 12,492.38 : x
2. Step 2: Convert to fraction form
   42,072.46/63,109.60 = 12,492.38/x
3. Step 3: Cross multiply
   42,072.46x = 63,109.60 × 12,492.38
4. Step 4: Simplify right side
   42,072.46x = 788,389,104.85
5. Step 5: Solve for x
   x = 788,389,104.85/42,072.46
6. Step 6: Final answer
   x = 18,738.84