Finding the Fourth Proportional to 55,128.21, 82,686.17 and 15,150.26

Step by Step Solution

1. Step 1: Write the proportion equation
   55,128.21 : 82,686.17 = 15,150.26 : x
2. Step 2: Convert to fraction form
   55,128.21/82,686.17 = 15,150.26/x
3. Step 3: Cross multiply
   55,128.21x = 82,686.17 × 15,150.26
4. Step 4: Simplify right side
   55,128.21x = 1,252,716,484.72
5. Step 5: Solve for x
   x = 1,252,716,484.72/55,128.21
6. Step 6: Final answer
   x = 22,723.69