Finding the Fourth Proportional to 22,612, 31,204.56 and 13,780

Step by Step Solution

1. Step 1: Write the proportion equation
   22,612 : 31,204.56 = 13,780 : x
2. Step 2: Convert to fraction form
   22,612/31,204.56 = 13,780/x
3. Step 3: Cross multiply
   22,612x = 31,204.56 × 13,780
4. Step 4: Simplify right side
   22,612x = 429,998,836.80
5. Step 5: Solve for x
   x = 429,998,836.80/22,612
6. Step 6: Final answer
   x = 19,016.40