Finding the Fourth Proportional to 171,501.50, 257,114.88 and 81,499.05

Step by Step Solution

1. Step 1: Write the proportion equation
   171,501.50 : 257,114.88 = 81,499.05 : x
2. Step 2: Convert to fraction form
   171,501.50/257,114.88 = 81,499.05/x
3. Step 3: Cross multiply
   171,501.50x = 257,114.88 × 81,499.05
4. Step 4: Simplify right side
   171,501.50x = 20,954,618,328.51
5. Step 5: Solve for x
   x = 20,954,618,328.51/171,501.50
6. Step 6: Final answer
   x = 122,183.29