Finding the Fourth Proportional to 175,401.78, 263,141.55 and 81,856.50

Step by Step Solution

1. Step 1: Write the proportion equation
   175,401.78 : 263,141.55 = 81,856.50 : x
2. Step 2: Convert to fraction form
   175,401.78/263,141.55 = 81,856.50/x
3. Step 3: Cross multiply
   175,401.78x = 263,141.55 × 81,856.50
4. Step 4: Simplify right side
   175,401.78x = 21,539,846,287.58
5. Step 5: Solve for x
   x = 21,539,846,287.58/175,401.78
6. Step 6: Final answer
   x = 122,802.89