Finding the Fourth Proportional to 9,090.72, 13,628.71 and 4,089.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,090.72 : 13,628.71 = 4,089.43 : x
2. Step 2: Convert to fraction form
   9,090.72/13,628.71 = 4,089.43/x
3. Step 3: Cross multiply
   9,090.72x = 13,628.71 × 4,089.43
4. Step 4: Simplify right side
   9,090.72x = 55,733,655.54
5. Step 5: Solve for x
   x = 55,733,655.54/9,090.72
6. Step 6: Final answer
   x = 6,130.83