Finding the Fourth Proportional to 6,109.30, 9,162.24 and 5,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   6,109.30 : 9,162.24 = 5,128.48 : x
2. Step 2: Convert to fraction form
   6,109.30/9,162.24 = 5,128.48/x
3. Step 3: Cross multiply
   6,109.30x = 9,162.24 × 5,128.48
4. Step 4: Simplify right side
   6,109.30x = 46,988,364.60
5. Step 5: Solve for x
   x = 46,988,364.60/6,109.30
6. Step 6: Final answer
   x = 7,691.28