Finding the Fourth Proportional to 13,979.56, 19,291.06 and 7,690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,979.56 : 19,291.06 = 7,690.72 : x
2. Step 2: Convert to fraction form
   13,979.56/19,291.06 = 7,690.72/x
3. Step 3: Cross multiply
   13,979.56x = 19,291.06 × 7,690.72
4. Step 4: Simplify right side
   13,979.56x = 148,362,140.96
5. Step 5: Solve for x
   x = 148,362,140.96/13,979.56
6. Step 6: Final answer
   x = 10,612.79