Finding the Fourth Proportional to 2,116.32, 2,920.20 and 1,276.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,116.32 : 2,920.20 = 1,276.86 : x
2. Step 2: Convert to fraction form
   2,116.32/2,920.20 = 1,276.86/x
3. Step 3: Cross multiply
   2,116.32x = 2,920.20 × 1,276.86
4. Step 4: Simplify right side
   2,116.32x = 3,728,686.57
5. Step 5: Solve for x
   x = 3,728,686.57/2,116.32
6. Step 6: Final answer
   x = 1,761.87