Finding the Fourth Proportional to 2,487.72, 3,729.06 and 1,187.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.72 : 3,729.06 = 1,187.76 : x
2. Step 2: Convert to fraction form
   2,487.72/3,729.06 = 1,187.76/x
3. Step 3: Cross multiply
   2,487.72x = 3,729.06 × 1,187.76
4. Step 4: Simplify right side
   2,487.72x = 4,429,228.31
5. Step 5: Solve for x
   x = 4,429,228.31/2,487.72
6. Step 6: Final answer
   x = 1,780.44