Finding the Fourth Proportional to 85,340.61, 128,031.69 and 28,414.37

Step by Step Solution

1. Step 1: Write the proportion equation
   85,340.61 : 128,031.69 = 28,414.37 : x
2. Step 2: Convert to fraction form
   85,340.61/128,031.69 = 28,414.37/x
3. Step 3: Cross multiply
   85,340.61x = 128,031.69 × 28,414.37
4. Step 4: Simplify right side
   85,340.61x = 3,637,939,171.23
5. Step 5: Solve for x
   x = 3,637,939,171.23/85,340.61
6. Step 6: Final answer
   x = 42,628.46