Finding the Fourth Proportional to 1,086.72, 1,630.31 and 538.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.72 : 1,630.31 = 538.26 : x
2. Step 2: Convert to fraction form
   1,086.72/1,630.31 = 538.26/x
3. Step 3: Cross multiply
   1,086.72x = 1,630.31 × 538.26
4. Step 4: Simplify right side
   1,086.72x = 877,527.97
5. Step 5: Solve for x
   x = 877,527.97/1,086.72
6. Step 6: Final answer
   x = 807.50