Finding the Fourth Proportional to 42,062.72, 63,093.76 and 12,480.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,062.72 : 63,093.76 = 12,480.64 : x
2. Step 2: Convert to fraction form
   42,062.72/63,093.76 = 12,480.64/x
3. Step 3: Cross multiply
   42,062.72x = 63,093.76 × 12,480.64
4. Step 4: Simplify right side
   42,062.72x = 787,450,504.81
5. Step 5: Solve for x
   x = 787,450,504.81/42,062.72
6. Step 6: Final answer
   x = 18,720.87