Finding the Fourth Proportional to 3,669.86, 5,064.39 and 1,991.16

Step by Step Solution

1. Step 1: Write the proportion equation
   3,669.86 : 5,064.39 = 1,991.16 : x
2. Step 2: Convert to fraction form
   3,669.86/5,064.39 = 1,991.16/x
3. Step 3: Cross multiply
   3,669.86x = 5,064.39 × 1,991.16
4. Step 4: Simplify right side
   3,669.86x = 10,084,010.79
5. Step 5: Solve for x
   x = 10,084,010.79/3,669.86
6. Step 6: Final answer
   x = 2,747.79