Finding the Fourth Proportional to 5,118.36, 7,061 and 3,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,118.36 : 7,061 = 3,128.50 : x
2. Step 2: Convert to fraction form
   5,118.36/7,061 = 3,128.50/x
3. Step 3: Cross multiply
   5,118.36x = 7,061 × 3,128.50
4. Step 4: Simplify right side
   5,118.36x = 22,090,338.50
5. Step 5: Solve for x
   x = 22,090,338.50/5,118.36
6. Step 6: Final answer
   x = 4,315.90