Finding the Fourth Proportional to 2,649.32, 3,972.06 and 1,187.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,649.32 : 3,972.06 = 1,187.72 : x
2. Step 2: Convert to fraction form
   2,649.32/3,972.06 = 1,187.72/x
3. Step 3: Cross multiply
   2,649.32x = 3,972.06 × 1,187.72
4. Step 4: Simplify right side
   2,649.32x = 4,717,695.10
5. Step 5: Solve for x
   x = 4,717,695.10/2,649.32
6. Step 6: Final answer
   x = 1,780.72