Finding the Fourth Proportional to 5,109.61, 7,051.05 and 2,871.61

Step by Step Solution

1. Step 1: Write the proportion equation
   5,109.61 : 7,051.05 = 2,871.61 : x
2. Step 2: Convert to fraction form
   5,109.61/7,051.05 = 2,871.61/x
3. Step 3: Cross multiply
   5,109.61x = 7,051.05 × 2,871.61
4. Step 4: Simplify right side
   5,109.61x = 20,247,865.69
5. Step 5: Solve for x
   x = 20,247,865.69/5,109.61
6. Step 6: Final answer
   x = 3,962.70