Finding the Fourth Proportional to 22,304.16, 30,780 and 12,875.76

Step by Step Solution

1. Step 1: Write the proportion equation
   22,304.16 : 30,780 = 12,875.76 : x
2. Step 2: Convert to fraction form
   22,304.16/30,780 = 12,875.76/x
3. Step 3: Cross multiply
   22,304.16x = 30,780 × 12,875.76
4. Step 4: Simplify right side
   22,304.16x = 396,315,892.80
5. Step 5: Solve for x
   x = 396,315,892.80/22,304.16
6. Step 6: Final answer
   x = 17,768.70