Finding the Fourth Proportional to 2,551.06, 3,826.63 and 991.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.06 : 3,826.63 = 991.15 : x
2. Step 2: Convert to fraction form
   2,551.06/3,826.63 = 991.15/x
3. Step 3: Cross multiply
   2,551.06x = 3,826.63 × 991.15
4. Step 4: Simplify right side
   2,551.06x = 3,792,764.32
5. Step 5: Solve for x
   x = 3,792,764.32/2,551.06
6. Step 6: Final answer
   x = 1,486.74