Finding the Fourth Proportional to 2,071.80, 3,109.32 and 773.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.80 : 3,109.32 = 773.64 : x
2. Step 2: Convert to fraction form
   2,071.80/3,109.32 = 773.64/x
3. Step 3: Cross multiply
   2,071.80x = 3,109.32 × 773.64
4. Step 4: Simplify right side
   2,071.80x = 2,405,494.32
5. Step 5: Solve for x
   x = 2,405,494.32/2,071.80
6. Step 6: Final answer
   x = 1,161.06