Finding the Fourth Proportional to 1,991.96, 2,748.74 and 1,152.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.96 : 2,748.74 = 1,152.72 : x
2. Step 2: Convert to fraction form
   1,991.96/2,748.74 = 1,152.72/x
3. Step 3: Cross multiply
   1,991.96x = 2,748.74 × 1,152.72
4. Step 4: Simplify right side
   1,991.96x = 3,168,521.81
5. Step 5: Solve for x
   x = 3,168,521.81/1,991.96
6. Step 6: Final answer
   x = 1,590.66