Finding the Fourth Proportional to 1,086.31, 1,627.16 and 501.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.31 : 1,627.16 = 501.79 : x
2. Step 2: Convert to fraction form
   1,086.31/1,627.16 = 501.79/x
3. Step 3: Cross multiply
   1,086.31x = 1,627.16 × 501.79
4. Step 4: Simplify right side
   1,086.31x = 816,492.62
5. Step 5: Solve for x
   x = 816,492.62/1,086.31
6. Step 6: Final answer
   x = 751.62