Finding the Fourth Proportional to 85,340.51, 128,031.56 and 28,414.31

Step by Step Solution

1. Step 1: Write the proportion equation
   85,340.51 : 128,031.56 = 28,414.31 : x
2. Step 2: Convert to fraction form
   85,340.51/128,031.56 = 28,414.31/x
3. Step 3: Cross multiply
   85,340.51x = 128,031.56 × 28,414.31
4. Step 4: Simplify right side
   85,340.51x = 3,637,928,293.55
5. Step 5: Solve for x
   x = 3,637,928,293.55/85,340.51
6. Step 6: Final answer
   x = 42,628.39