Finding the Fourth Proportional to 7,881.16, 10,868.42 and 5,187.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,881.16 : 10,868.42 = 5,187.56 : x
2. Step 2: Convert to fraction form
   7,881.16/10,868.42 = 5,187.56/x
3. Step 3: Cross multiply
   7,881.16x = 10,868.42 × 5,187.56
4. Step 4: Simplify right side
   7,881.16x = 56,380,580.86
5. Step 5: Solve for x
   x = 56,380,580.86/7,881.16
6. Step 6: Final answer
   x = 7,153.84