Finding the Fourth Proportional to 1,991.27, 2,748.86 and 1,245.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.27 : 2,748.86 = 1,245.71 : x
2. Step 2: Convert to fraction form
   1,991.27/2,748.86 = 1,245.71/x
3. Step 3: Cross multiply
   1,991.27x = 2,748.86 × 1,245.71
4. Step 4: Simplify right side
   1,991.27x = 3,424,282.39
5. Step 5: Solve for x
   x = 3,424,282.39/1,991.27
6. Step 6: Final answer
   x = 1,719.65