Finding the Fourth Proportional to 2,372.72, 3,557.56 and 987.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,372.72 : 3,557.56 = 987.02 : x
2. Step 2: Convert to fraction form
   2,372.72/3,557.56 = 987.02/x
3. Step 3: Cross multiply
   2,372.72x = 3,557.56 × 987.02
4. Step 4: Simplify right side
   2,372.72x = 3,511,382.87
5. Step 5: Solve for x
   x = 3,511,382.87/2,372.72
6. Step 6: Final answer
   x = 1,479.90