Finding the Fourth Proportional to 5,156.76, 7,721.37 and 4,111.86

Step by Step Solution

1. Step 1: Write the proportion equation
   5,156.76 : 7,721.37 = 4,111.86 : x
2. Step 2: Convert to fraction form
   5,156.76/7,721.37 = 4,111.86/x
3. Step 3: Cross multiply
   5,156.76x = 7,721.37 × 4,111.86
4. Step 4: Simplify right side
   5,156.76x = 31,749,192.45
5. Step 5: Solve for x
   x = 31,749,192.45/5,156.76
6. Step 6: Final answer
   x = 6,156.81