Finding the Fourth Proportional to 309,697.25, 464,544.98 and 85,057.89

Step by Step Solution

1. Step 1: Write the proportion equation
   309,697.25 : 464,544.98 = 85,057.89 : x
2. Step 2: Convert to fraction form
   309,697.25/464,544.98 = 85,057.89/x
3. Step 3: Cross multiply
   309,697.25x = 464,544.98 × 85,057.89
4. Step 4: Simplify right side
   309,697.25x = 39,513,215,808.89
5. Step 5: Solve for x
   x = 39,513,215,808.89/309,697.25
6. Step 6: Final answer
   x = 127,586.59