Finding the Fourth Proportional to 1,087.68, 1,630.72 and 540.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.68 : 1,630.72 = 540.25 : x
2. Step 2: Convert to fraction form
   1,087.68/1,630.72 = 540.25/x
3. Step 3: Cross multiply
   1,087.68x = 1,630.72 × 540.25
4. Step 4: Simplify right side
   1,087.68x = 880,999.21
5. Step 5: Solve for x
   x = 880,999.21/1,087.68
6. Step 6: Final answer
   x = 809.98