Finding the Fourth Proportional to 7,111.08, 9,814.23 and 5,128.20

Step by Step Solution

1. Step 1: Write the proportion equation
   7,111.08 : 9,814.23 = 5,128.20 : x
2. Step 2: Convert to fraction form
   7,111.08/9,814.23 = 5,128.20/x
3. Step 3: Cross multiply
   7,111.08x = 9,814.23 × 5,128.20
4. Step 4: Simplify right side
   7,111.08x = 50,329,334.29
5. Step 5: Solve for x
   x = 50,329,334.29/7,111.08
6. Step 6: Final answer
   x = 7,077.59