Finding the Fourth Proportional to 707,268.69, 976,013.69 and 405,443.25

Step by Step Solution

1. Step 1: Write the proportion equation
   707,268.69 : 976,013.69 = 405,443.25 : x
2. Step 2: Convert to fraction form
   707,268.69/976,013.69 = 405,443.25/x
3. Step 3: Cross multiply
   707,268.69x = 976,013.69 × 405,443.25
4. Step 4: Simplify right side
   707,268.69x = 395,718,160,490.88
5. Step 5: Solve for x
   x = 395,718,160,490.88/707,268.69
6. Step 6: Final answer
   x = 559,501.88