Finding the Fourth Proportional to 13,976.42, 19,288.40 and 7,688.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,976.42 : 19,288.40 = 7,688.79 : x
2. Step 2: Convert to fraction form
   13,976.42/19,288.40 = 7,688.79/x
3. Step 3: Cross multiply
   13,976.42x = 19,288.40 × 7,688.79
4. Step 4: Simplify right side
   13,976.42x = 148,304,418.59
5. Step 5: Solve for x
   x = 148,304,418.59/13,976.42
6. Step 6: Final answer
   x = 10,611.05