Finding the Fourth Proportional to 1,215.09, 1,677.60 and 796.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.09 : 1,677.60 = 796.05 : x
2. Step 2: Convert to fraction form
   1,215.09/1,677.60 = 796.05/x
3. Step 3: Cross multiply
   1,215.09x = 1,677.60 × 796.05
4. Step 4: Simplify right side
   1,215.09x = 1,335,453.48
5. Step 5: Solve for x
   x = 1,335,453.48/1,215.09
6. Step 6: Final answer
   x = 1,099.06