Finding the Fourth Proportional to 1,991.39, 2,748.06 and 1,151.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.39 : 2,748.06 = 1,151.55 : x
2. Step 2: Convert to fraction form
   1,991.39/2,748.06 = 1,151.55/x
3. Step 3: Cross multiply
   1,991.39x = 2,748.06 × 1,151.55
4. Step 4: Simplify right side
   1,991.39x = 3,164,528.49
5. Step 5: Solve for x
   x = 3,164,528.49/1,991.39
6. Step 6: Final answer
   x = 1,589.11