Finding the Fourth Proportional to 2,448.42, 3,672.90 and 987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,448.42 : 3,672.90 = 987.72 : x
2. Step 2: Convert to fraction form
   2,448.42/3,672.90 = 987.72/x
3. Step 3: Cross multiply
   2,448.42x = 3,672.90 × 987.72
4. Step 4: Simplify right side
   2,448.42x = 3,627,796.79
5. Step 5: Solve for x
   x = 3,627,796.79/2,448.42
6. Step 6: Final answer
   x = 1,481.69