Finding the Fourth Proportional to 42,469.92, 63,705.03 and 12,888

Step by Step Solution

1. Step 1: Write the proportion equation
   42,469.92 : 63,705.03 = 12,888 : x
2. Step 2: Convert to fraction form
   42,469.92/63,705.03 = 12,888/x
3. Step 3: Cross multiply
   42,469.92x = 63,705.03 × 12,888
4. Step 4: Simplify right side
   42,469.92x = 821,030,426.64
5. Step 5: Solve for x
   x = 821,030,426.64/42,469.92
6. Step 6: Final answer
   x = 19,332.05