Finding the Fourth Proportional to 820,874.79, 1,231,501.86 and 259,909.29

Step by Step Solution

1. Step 1: Write the proportion equation
   820,874.79 : 1,231,501.86 = 259,909.29 : x
2. Step 2: Convert to fraction form
   820,874.79/1,231,501.86 = 259,909.29/x
3. Step 3: Cross multiply
   820,874.79x = 1,231,501.86 × 259,909.29
4. Step 4: Simplify right side
   820,874.79x = 320,078,774,066.28
5. Step 5: Solve for x
   x = 320,078,774,066.28/820,874.79
6. Step 6: Final answer
   x = 389,923.99