Finding the Fourth Proportional to 2,379.83, 3,569.64 and 648.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.83 : 3,569.64 = 648.45 : x
2. Step 2: Convert to fraction form
   2,379.83/3,569.64 = 648.45/x
3. Step 3: Cross multiply
   2,379.83x = 3,569.64 × 648.45
4. Step 4: Simplify right side
   2,379.83x = 2,314,741.98
5. Step 5: Solve for x
   x = 2,314,741.98/2,379.83
6. Step 6: Final answer
   x = 972.65