Finding the Fourth Proportional to 1,196.48, 1,647.78 and 987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.48 : 1,647.78 = 987.50 : x
2. Step 2: Convert to fraction form
   1,196.48/1,647.78 = 987.50/x
3. Step 3: Cross multiply
   1,196.48x = 1,647.78 × 987.50
4. Step 4: Simplify right side
   1,196.48x = 1,627,182.75
5. Step 5: Solve for x
   x = 1,627,182.75/1,196.48
6. Step 6: Final answer
   x = 1,359.97