Finding the Fourth Proportional to 1,991.57, 2,748.17 and 1,152.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.57 : 2,748.17 = 1,152.11 : x
2. Step 2: Convert to fraction form
   1,991.57/2,748.17 = 1,152.11/x
3. Step 3: Cross multiply
   1,991.57x = 2,748.17 × 1,152.11
4. Step 4: Simplify right side
   1,991.57x = 3,166,174.64
5. Step 5: Solve for x
   x = 3,166,174.64/1,991.57
6. Step 6: Final answer
   x = 1,589.79