Finding the Fourth Proportional to 2,167.59, 2,991.28 and 1,236.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,167.59 : 2,991.28 = 1,236.09 : x
2. Step 2: Convert to fraction form
   2,167.59/2,991.28 = 1,236.09/x
3. Step 3: Cross multiply
   2,167.59x = 2,991.28 × 1,236.09
4. Step 4: Simplify right side
   2,167.59x = 3,697,501.74
5. Step 5: Solve for x
   x = 3,697,501.74/2,167.59
6. Step 6: Final answer
   x = 1,705.81