Finding the Fourth Proportional to 826,086.81, 1,239,111.99 and 339,666.42

Step by Step Solution

1. Step 1: Write the proportion equation
   826,086.81 : 1,239,111.99 = 339,666.42 : x
2. Step 2: Convert to fraction form
   826,086.81/1,239,111.99 = 339,666.42/x
3. Step 3: Cross multiply
   826,086.81x = 1,239,111.99 × 339,666.42
4. Step 4: Simplify right side
   826,086.81x = 420,884,733,622.38
5. Step 5: Solve for x
   x = 420,884,733,622.38/826,086.81
6. Step 6: Final answer
   x = 509,492.14