Finding the Fourth Proportional to 1,435.23, 1,980.59 and 805.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.23 : 1,980.59 = 805.76 : x
2. Step 2: Convert to fraction form
   1,435.23/1,980.59 = 805.76/x
3. Step 3: Cross multiply
   1,435.23x = 1,980.59 × 805.76
4. Step 4: Simplify right side
   1,435.23x = 1,595,873.69
5. Step 5: Solve for x
   x = 1,595,873.69/1,435.23
6. Step 6: Final answer
   x = 1,111.93