Finding the Fourth Proportional to 2,116.86, 3,174.54 and 817.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.86 : 3,174.54 = 817.98 : x
2. Step 2: Convert to fraction form
   2,116.86/3,174.54 = 817.98/x
3. Step 3: Cross multiply
   2,116.86x = 3,174.54 × 817.98
4. Step 4: Simplify right side
   2,116.86x = 2,596,710.23
5. Step 5: Solve for x
   x = 2,596,710.23/2,116.86
6. Step 6: Final answer
   x = 1,226.68