Finding the Fourth Proportional to 3,669.78, 5,064.27 and 1,991.22

Step by Step Solution

1. Step 1: Write the proportion equation
   3,669.78 : 5,064.27 = 1,991.22 : x
2. Step 2: Convert to fraction form
   3,669.78/5,064.27 = 1,991.22/x
3. Step 3: Cross multiply
   3,669.78x = 5,064.27 × 1,991.22
4. Step 4: Simplify right side
   3,669.78x = 10,084,075.71
5. Step 5: Solve for x
   x = 10,084,075.71/3,669.78
6. Step 6: Final answer
   x = 2,747.87