Finding the Fourth Proportional to 5,118.39, 7,061.31 and 3,128.22

Step by Step Solution

1. Step 1: Write the proportion equation
   5,118.39 : 7,061.31 = 3,128.22 : x
2. Step 2: Convert to fraction form
   5,118.39/7,061.31 = 3,128.22/x
3. Step 3: Cross multiply
   5,118.39x = 7,061.31 × 3,128.22
4. Step 4: Simplify right side
   5,118.39x = 22,089,331.17
5. Step 5: Solve for x
   x = 22,089,331.17/5,118.39
6. Step 6: Final answer
   x = 4,315.68