Finding the Fourth Proportional to 2,628.55, 3,927.56 and 1,991.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.55 : 3,927.56 = 1,991.08 : x
2. Step 2: Convert to fraction form
   2,628.55/3,927.56 = 1,991.08/x
3. Step 3: Cross multiply
   2,628.55x = 3,927.56 × 1,991.08
4. Step 4: Simplify right side
   2,628.55x = 7,820,066.53
5. Step 5: Solve for x
   x = 7,820,066.53/2,628.55
6. Step 6: Final answer
   x = 2,975.06