Finding the Fourth Proportional to 2,648.32, 3,970.56 and 1,186.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.32 : 3,970.56 = 1,186.72 : x
2. Step 2: Convert to fraction form
   2,648.32/3,970.56 = 1,186.72/x
3. Step 3: Cross multiply
   2,648.32x = 3,970.56 × 1,186.72
4. Step 4: Simplify right side
   2,648.32x = 4,711,942.96
5. Step 5: Solve for x
   x = 4,711,942.96/2,648.32
6. Step 6: Final answer
   x = 1,779.22