Finding the Fourth Proportional to 8,061.40, 11,128.64 and 5,407.84

Step by Step Solution

1. Step 1: Write the proportion equation
   8,061.40 : 11,128.64 = 5,407.84 : x
2. Step 2: Convert to fraction form
   8,061.40/11,128.64 = 5,407.84/x
3. Step 3: Cross multiply
   8,061.40x = 11,128.64 × 5,407.84
4. Step 4: Simplify right side
   8,061.40x = 60,181,904.54
5. Step 5: Solve for x
   x = 60,181,904.54/8,061.40
6. Step 6: Final answer
   x = 7,465.44