Finding the Fourth Proportional to 9,090.20, 12,543.72 and 5,111.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,090.20 : 12,543.72 = 5,111.75 : x
2. Step 2: Convert to fraction form
   9,090.20/12,543.72 = 5,111.75/x
3. Step 3: Cross multiply
   9,090.20x = 12,543.72 × 5,111.75
4. Step 4: Simplify right side
   9,090.20x = 64,120,360.71
5. Step 5: Solve for x
   x = 64,120,360.71/9,090.20
6. Step 6: Final answer
   x = 7,053.79