Finding the Fourth Proportional to 9,089.90, 12,543.81 and 5,111.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,089.90 : 12,543.81 = 5,111.28 : x
2. Step 2: Convert to fraction form
   9,089.90/12,543.81 = 5,111.28/x
3. Step 3: Cross multiply
   9,089.90x = 12,543.81 × 5,111.28
4. Step 4: Simplify right side
   9,089.90x = 64,114,899.48
5. Step 5: Solve for x
   x = 64,114,899.48/9,089.90
6. Step 6: Final answer
   x = 7,053.43