Finding the Fourth Proportional to 7,877.72, 10,871.82 and 5,487.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,877.72 : 10,871.82 = 5,487.80 : x
2. Step 2: Convert to fraction form
   7,877.72/10,871.82 = 5,487.80/x
3. Step 3: Cross multiply
   7,877.72x = 10,871.82 × 5,487.80
4. Step 4: Simplify right side
   7,877.72x = 59,662,373.80
5. Step 5: Solve for x
   x = 59,662,373.80/7,877.72
6. Step 6: Final answer
   x = 7,573.56