Finding the Fourth Proportional to 5,086.18, 7,631.10 and 3,136.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,086.18 : 7,631.10 = 3,136.12 : x
2. Step 2: Convert to fraction form
   5,086.18/7,631.10 = 3,136.12/x
3. Step 3: Cross multiply
   5,086.18x = 7,631.10 × 3,136.12
4. Step 4: Simplify right side
   5,086.18x = 23,932,045.33
5. Step 5: Solve for x
   x = 23,932,045.33/5,086.18
6. Step 6: Final answer
   x = 4,705.31