Finding the Fourth Proportional to 11,451.33, 15,807.60 and 7,871.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,451.33 : 15,807.60 = 7,871.42 : x
2. Step 2: Convert to fraction form
   11,451.33/15,807.60 = 7,871.42/x
3. Step 3: Cross multiply
   11,451.33x = 15,807.60 × 7,871.42
4. Step 4: Simplify right side
   11,451.33x = 124,428,298.31
5. Step 5: Solve for x
   x = 124,428,298.31/11,451.33
6. Step 6: Final answer
   x = 10,865.84