Finding the Fourth Proportional to 1,087.98, 1,501.25 and 715.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.98 : 1,501.25 = 715.11 : x
2. Step 2: Convert to fraction form
   1,087.98/1,501.25 = 715.11/x
3. Step 3: Cross multiply
   1,087.98x = 1,501.25 × 715.11
4. Step 4: Simplify right side
   1,087.98x = 1,073,555.31
5. Step 5: Solve for x
   x = 1,073,555.31/1,087.98
6. Step 6: Final answer
   x = 986.74