Finding the Fourth Proportional to 505,061.56, 697,104.24 and 290,326.20

Step by Step Solution

1. Step 1: Write the proportion equation
   505,061.56 : 697,104.24 = 290,326.20 : x
2. Step 2: Convert to fraction form
   505,061.56/697,104.24 = 290,326.20/x
3. Step 3: Cross multiply
   505,061.56x = 697,104.24 × 290,326.20
4. Step 4: Simplify right side
   505,061.56x = 202,387,625,003.09
5. Step 5: Solve for x
   x = 202,387,625,003.09/505,061.56
6. Step 6: Final answer
   x = 400,718.73