Finding the Fourth Proportional to 6,111.56, 8,428.92 and 5,137.74

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.56 : 8,428.92 = 5,137.74 : x
2. Step 2: Convert to fraction form
   6,111.56/8,428.92 = 5,137.74/x
3. Step 3: Cross multiply
   6,111.56x = 8,428.92 × 5,137.74
4. Step 4: Simplify right side
   6,111.56x = 43,305,599.44
5. Step 5: Solve for x
   x = 43,305,599.44/6,111.56
6. Step 6: Final answer
   x = 7,085.86