Finding the Fourth Proportional to 1,435.01, 1,980.27 and 805.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.01 : 1,980.27 = 805.60 : x
2. Step 2: Convert to fraction form
   1,435.01/1,980.27 = 805.60/x
3. Step 3: Cross multiply
   1,435.01x = 1,980.27 × 805.60
4. Step 4: Simplify right side
   1,435.01x = 1,595,315.82
5. Step 5: Solve for x
   x = 1,595,315.82/1,435.01
6. Step 6: Final answer
   x = 1,111.71