Finding the Fourth Proportional to 1,435.06, 1,980.25 and 805.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.06 : 1,980.25 = 805.69 : x
2. Step 2: Convert to fraction form
   1,435.06/1,980.25 = 805.69/x
3. Step 3: Cross multiply
   1,435.06x = 1,980.25 × 805.69
4. Step 4: Simplify right side
   1,435.06x = 1,595,460.66
5. Step 5: Solve for x
   x = 1,595,460.66/1,435.06
6. Step 6: Final answer
   x = 1,111.77