Finding the Fourth Proportional to 2,648.50, 3,971.79 and 1,186.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.50 : 3,971.79 = 1,186.90 : x
2. Step 2: Convert to fraction form
   2,648.50/3,971.79 = 1,186.90/x
3. Step 3: Cross multiply
   2,648.50x = 3,971.79 × 1,186.90
4. Step 4: Simplify right side
   2,648.50x = 4,714,117.55
5. Step 5: Solve for x
   x = 4,714,117.55/2,648.50
6. Step 6: Final answer
   x = 1,779.92