Finding the Fourth Proportional to 1,435.47, 1,980.90 and 814.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.47 : 1,980.90 = 814.47 : x
2. Step 2: Convert to fraction form
   1,435.47/1,980.90 = 814.47/x
3. Step 3: Cross multiply
   1,435.47x = 1,980.90 × 814.47
4. Step 4: Simplify right side
   1,435.47x = 1,613,383.62
5. Step 5: Solve for x
   x = 1,613,383.62/1,435.47
6. Step 6: Final answer
   x = 1,123.94