Finding the Fourth Proportional to 2,086.79, 3,130.80 and 626.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.79 : 3,130.80 = 626.16 : x
2. Step 2: Convert to fraction form
   2,086.79/3,130.80 = 626.16/x
3. Step 3: Cross multiply
   2,086.79x = 3,130.80 × 626.16
4. Step 4: Simplify right side
   2,086.79x = 1,960,378.60
5. Step 5: Solve for x
   x = 1,960,378.60/2,086.79
6. Step 6: Final answer
   x = 939.42