Finding the Fourth Proportional to 1,314.80, 1,814.24 and 790.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.80 : 1,814.24 = 790.56 : x
2. Step 2: Convert to fraction form
   1,314.80/1,814.24 = 790.56/x
3. Step 3: Cross multiply
   1,314.80x = 1,814.24 × 790.56
4. Step 4: Simplify right side
   1,314.80x = 1,434,265.57
5. Step 5: Solve for x
   x = 1,434,265.57/1,314.80
6. Step 6: Final answer
   x = 1,090.86