Finding the Fourth Proportional to 6,111.79, 9,157.92 and 3,918.70

Step by Step Solution

1. Step 1: Write the proportion equation
   6,111.79 : 9,157.92 = 3,918.70 : x
2. Step 2: Convert to fraction form
   6,111.79/9,157.92 = 3,918.70/x
3. Step 3: Cross multiply
   6,111.79x = 9,157.92 × 3,918.70
4. Step 4: Simplify right side
   6,111.79x = 35,887,141.10
5. Step 5: Solve for x
   x = 35,887,141.10/6,111.79
6. Step 6: Final answer
   x = 5,871.79