Finding the Fourth Proportional to 13,979.34, 19,291.22 and 7,691.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,979.34 : 19,291.22 = 7,691.72 : x
2. Step 2: Convert to fraction form
   13,979.34/19,291.22 = 7,691.72/x
3. Step 3: Cross multiply
   13,979.34x = 19,291.22 × 7,691.72
4. Step 4: Simplify right side
   13,979.34x = 148,382,662.70
5. Step 5: Solve for x
   x = 148,382,662.70/13,979.34
6. Step 6: Final answer
   x = 10,614.43