Finding the Fourth Proportional to 6,611.10, 9,906.12 and 3,490.98

Step by Step Solution

1. Step 1: Write the proportion equation
   6,611.10 : 9,906.12 = 3,490.98 : x
2. Step 2: Convert to fraction form
   6,611.10/9,906.12 = 3,490.98/x
3. Step 3: Cross multiply
   6,611.10x = 9,906.12 × 3,490.98
4. Step 4: Simplify right side
   6,611.10x = 34,582,066.80
5. Step 5: Solve for x
   x = 34,582,066.80/6,611.10
6. Step 6: Final answer
   x = 5,230.91