Finding the Fourth Proportional to 1,087.68, 1,501.67 and 715.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.68 : 1,501.67 = 715.32 : x
2. Step 2: Convert to fraction form
   1,087.68/1,501.67 = 715.32/x
3. Step 3: Cross multiply
   1,087.68x = 1,501.67 × 715.32
4. Step 4: Simplify right side
   1,087.68x = 1,074,171.01
5. Step 5: Solve for x
   x = 1,074,171.01/1,087.68
6. Step 6: Final answer
   x = 987.58