Finding the Fourth Proportional to 171,247.89, 256,866.52 and 81,355.30

Step by Step Solution

1. Step 1: Write the proportion equation
   171,247.89 : 256,866.52 = 81,355.30 : x
2. Step 2: Convert to fraction form
   171,247.89/256,866.52 = 81,355.30/x
3. Step 3: Cross multiply
   171,247.89x = 256,866.52 × 81,355.30
4. Step 4: Simplify right side
   171,247.89x = 20,897,451,103.45
5. Step 5: Solve for x
   x = 20,897,451,103.45/171,247.89
6. Step 6: Final answer
   x = 122,030.42