Finding the Fourth Proportional to 174,871.30, 262,436.55 and 128,215.30

Step by Step Solution

1. Step 1: Write the proportion equation
   174,871.30 : 262,436.55 = 128,215.30 : x
2. Step 2: Convert to fraction form
   174,871.30/262,436.55 = 128,215.30/x
3. Step 3: Cross multiply
   174,871.30x = 262,436.55 × 128,215.30
4. Step 4: Simplify right side
   174,871.30x = 33,648,380,989.22
5. Step 5: Solve for x
   x = 33,648,380,989.22/174,871.30
6. Step 6: Final answer
   x = 192,417.97