Finding the Fourth Proportional to 2,072.39, 3,108.78 and 773.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.39 : 3,108.78 = 773.55 : x
2. Step 2: Convert to fraction form
   2,072.39/3,108.78 = 773.55/x
3. Step 3: Cross multiply
   2,072.39x = 3,108.78 × 773.55
4. Step 4: Simplify right side
   2,072.39x = 2,404,796.77
5. Step 5: Solve for x
   x = 2,404,796.77/2,072.39
6. Step 6: Final answer
   x = 1,160.40