Finding the Fourth Proportional to 6,662.81, 9,991.31 and 3,542.06

Step by Step Solution

1. Step 1: Write the proportion equation
   6,662.81 : 9,991.31 = 3,542.06 : x
2. Step 2: Convert to fraction form
   6,662.81/9,991.31 = 3,542.06/x
3. Step 3: Cross multiply
   6,662.81x = 9,991.31 × 3,542.06
4. Step 4: Simplify right side
   6,662.81x = 35,389,826.77
5. Step 5: Solve for x
   x = 35,389,826.77/6,662.81
6. Step 6: Final answer
   x = 5,311.54