Finding the Fourth Proportional to 1,991.53, 2,748.77 and 1,291.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.53 : 2,748.77 = 1,291.69 : x
2. Step 2: Convert to fraction form
   1,991.53/2,748.77 = 1,291.69/x
3. Step 3: Cross multiply
   1,991.53x = 2,748.77 × 1,291.69
4. Step 4: Simplify right side
   1,991.53x = 3,550,558.72
5. Step 5: Solve for x
   x = 3,550,558.72/1,991.53
6. Step 6: Final answer
   x = 1,782.83