Finding the Fourth Proportional to 1,784.30, 2,462.28 and 987.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,784.30 : 2,462.28 = 987.57 : x
2. Step 2: Convert to fraction form
   1,784.30/2,462.28 = 987.57/x
3. Step 3: Cross multiply
   1,784.30x = 2,462.28 × 987.57
4. Step 4: Simplify right side
   1,784.30x = 2,431,673.86
5. Step 5: Solve for x
   x = 2,431,673.86/1,784.30
6. Step 6: Final answer
   x = 1,362.82