Finding the Fourth Proportional to 13,326.38, 19,983.45 and 7,781.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,326.38 : 19,983.45 = 7,781.42 : x
2. Step 2: Convert to fraction form
   13,326.38/19,983.45 = 7,781.42/x
3. Step 3: Cross multiply
   13,326.38x = 19,983.45 × 7,781.42
4. Step 4: Simplify right side
   13,326.38x = 155,499,617.50
5. Step 5: Solve for x
   x = 155,499,617.50/13,326.38
6. Step 6: Final answer
   x = 11,668.56