Finding the Fourth Proportional to 1,991.72, 2,749.80 and 1,283.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,991.72 : 2,749.80 = 1,283.81 : x
2. Step 2: Convert to fraction form
   1,991.72/2,749.80 = 1,283.81/x
3. Step 3: Cross multiply
   1,991.72x = 2,749.80 × 1,283.81
4. Step 4: Simplify right side
   1,991.72x = 3,530,227.61
5. Step 5: Solve for x
   x = 3,530,227.61/1,991.72
6. Step 6: Final answer
   x = 1,772.45