Finding the Fourth Proportional to 2,159.06, 3,236.69 and 1,279.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.06 : 3,236.69 = 1,279.40 : x
2. Step 2: Convert to fraction form
   2,159.06/3,236.69 = 1,279.40/x
3. Step 3: Cross multiply
   2,159.06x = 3,236.69 × 1,279.40
4. Step 4: Simplify right side
   2,159.06x = 4,140,998.61
5. Step 5: Solve for x
   x = 4,140,998.61/2,159.06
6. Step 6: Final answer
   x = 1,917.97