Finding the Fourth Proportional to 13,173.39, 19,761.90 and 5,380.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,173.39 : 19,761.90 = 5,380.38 : x
2. Step 2: Convert to fraction form
   13,173.39/19,761.90 = 5,380.38/x
3. Step 3: Cross multiply
   13,173.39x = 19,761.90 × 5,380.38
4. Step 4: Simplify right side
   13,173.39x = 106,326,531.52
5. Step 5: Solve for x
   x = 106,326,531.52/13,173.39
6. Step 6: Final answer
   x = 8,071.31