Finding the Fourth Proportional to 6,111.20, 8,434.14 and 3,721.28

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.20 : 8,434.14 = 3,721.28 : x
2. Step 2: Convert to fraction form
   6,111.20/8,434.14 = 3,721.28/x
3. Step 3: Cross multiply
   6,111.20x = 8,434.14 × 3,721.28
4. Step 4: Simplify right side
   6,111.20x = 31,385,796.50
5. Step 5: Solve for x
   x = 31,385,796.50/6,111.20
6. Step 6: Final answer
   x = 5,135.78