Finding the Fourth Proportional to 42,019.75, 63,007.35 and 12,433.51

Step by Step Solution

1. Step 1: Write the proportion equation
   42,019.75 : 63,007.35 = 12,433.51 : x
2. Step 2: Convert to fraction form
   42,019.75/63,007.35 = 12,433.51/x
3. Step 3: Cross multiply
   42,019.75x = 63,007.35 × 12,433.51
4. Step 4: Simplify right side
   42,019.75x = 783,402,516.30
5. Step 5: Solve for x
   x = 783,402,516.30/42,019.75
6. Step 6: Final answer
   x = 18,643.67