Finding the Fourth Proportional to 5,123.85, 7,687.01 and 1,791.60

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.85 : 7,687.01 = 1,791.60 : x
2. Step 2: Convert to fraction form
   5,123.85/7,687.01 = 1,791.60/x
3. Step 3: Cross multiply
   5,123.85x = 7,687.01 × 1,791.60
4. Step 4: Simplify right side
   5,123.85x = 13,771,999.72
5. Step 5: Solve for x
   x = 13,771,999.72/5,123.85
6. Step 6: Final answer
   x = 2,687.83