Finding the Fourth Proportional to 1,435.68, 1,980.72 and 814.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.68 : 1,980.72 = 814.32 : x
2. Step 2: Convert to fraction form
   1,435.68/1,980.72 = 814.32/x
3. Step 3: Cross multiply
   1,435.68x = 1,980.72 × 814.32
4. Step 4: Simplify right side
   1,435.68x = 1,612,939.91
5. Step 5: Solve for x
   x = 1,612,939.91/1,435.68
6. Step 6: Final answer
   x = 1,123.47