Finding the Fourth Proportional to 12,585.62, 17,374.83 and 7,871.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,585.62 : 17,374.83 = 7,871.42 : x
2. Step 2: Convert to fraction form
   12,585.62/17,374.83 = 7,871.42/x
3. Step 3: Cross multiply
   12,585.62x = 17,374.83 × 7,871.42
4. Step 4: Simplify right side
   12,585.62x = 136,764,584.36
5. Step 5: Solve for x
   x = 136,764,584.36/12,585.62
6. Step 6: Final answer
   x = 10,866.73