Finding the Fourth Proportional to 3,670.57, 5,065.37 and 1,991.96

Step by Step Solution

1. Step 1: Write the proportion equation
   3,670.57 : 5,065.37 = 1,991.96 : x
2. Step 2: Convert to fraction form
   3,670.57/5,065.37 = 1,991.96/x
3. Step 3: Cross multiply
   3,670.57x = 5,065.37 × 1,991.96
4. Step 4: Simplify right side
   3,670.57x = 10,090,004.47
5. Step 5: Solve for x
   x = 10,090,004.47/3,670.57
6. Step 6: Final answer
   x = 2,748.90