Finding the Fourth Proportional to 972.50, 1,339.89 and 867.60

Step by Step Solution

1. Step 1: Write the proportion equation
   972.50 : 1,339.89 = 867.60 : x
2. Step 2: Convert to fraction form
   972.50/1,339.89 = 867.60/x
3. Step 3: Cross multiply
   972.50x = 1,339.89 × 867.60
4. Step 4: Simplify right side
   972.50x = 1,162,488.56
5. Step 5: Solve for x
   x = 1,162,488.56/972.50
6. Step 6: Final answer
   x = 1,195.37