Finding the Fourth Proportional to 1,368.72, 2,054.90 and 814.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.72 : 2,054.90 = 814.46 : x
2. Step 2: Convert to fraction form
   1,368.72/2,054.90 = 814.46/x
3. Step 3: Cross multiply
   1,368.72x = 2,054.90 × 814.46
4. Step 4: Simplify right side
   1,368.72x = 1,673,619.51
5. Step 5: Solve for x
   x = 1,673,619.51/1,368.72
6. Step 6: Final answer
   x = 1,222.76