Finding the Fourth Proportional to 1,022.52, 1,523.37 and 987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022.52 : 1,523.37 = 987.72 : x
2. Step 2: Convert to fraction form
   1,022.52/1,523.37 = 987.72/x
3. Step 3: Cross multiply
   1,022.52x = 1,523.37 × 987.72
4. Step 4: Simplify right side
   1,022.52x = 1,504,663.02
5. Step 5: Solve for x
   x = 1,504,663.02/1,022.52
6. Step 6: Final answer
   x = 1,471.52