Finding the Fourth Proportional to 2,379.69, 3,569.63 and 648.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.69 : 3,569.63 = 648.31 : x
2. Step 2: Convert to fraction form
   2,379.69/3,569.63 = 648.31/x
3. Step 3: Cross multiply
   2,379.69x = 3,569.63 × 648.31
4. Step 4: Simplify right side
   2,379.69x = 2,314,226.83
5. Step 5: Solve for x
   x = 2,314,226.83/2,379.69
6. Step 6: Final answer
   x = 972.49