Finding the Fourth Proportional to 2,379.15, 3,569.34 and 917.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,379.15 : 3,569.34 = 917.91 : x
2. Step 2: Convert to fraction form
   2,379.15/3,569.34 = 917.91/x
3. Step 3: Cross multiply
   2,379.15x = 3,569.34 × 917.91
4. Step 4: Simplify right side
   2,379.15x = 3,276,332.88
5. Step 5: Solve for x
   x = 3,276,332.88/2,379.15
6. Step 6: Final answer
   x = 1,377.10