Finding the Fourth Proportional to 42,472.38, 63,705.32 and 12,890.37

Step by Step Solution

1. Step 1: Write the proportion equation
   42,472.38 : 63,705.32 = 12,890.37 : x
2. Step 2: Convert to fraction form
   42,472.38/63,705.32 = 12,890.37/x
3. Step 3: Cross multiply
   42,472.38x = 63,705.32 × 12,890.37
4. Step 4: Simplify right side
   42,472.38x = 821,185,145.77
5. Step 5: Solve for x
   x = 821,185,145.77/42,472.38
6. Step 6: Final answer
   x = 19,334.57