Finding the Fourth Proportional to 2,632.42, 3,947.41 and 987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,632.42 : 3,947.41 = 987.72 : x
2. Step 2: Convert to fraction form
   2,632.42/3,947.41 = 987.72/x
3. Step 3: Cross multiply
   2,632.42x = 3,947.41 × 987.72
4. Step 4: Simplify right side
   2,632.42x = 3,898,935.81
5. Step 5: Solve for x
   x = 3,898,935.81/2,632.42
6. Step 6: Final answer
   x = 1,481.12