Finding the Fourth Proportional to 2,086.50, 3,130.83 and 917.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.50 : 3,130.83 = 917.32 : x
2. Step 2: Convert to fraction form
   2,086.50/3,130.83 = 917.32/x
3. Step 3: Cross multiply
   2,086.50x = 3,130.83 × 917.32
4. Step 4: Simplify right side
   2,086.50x = 2,871,968.39
5. Step 5: Solve for x
   x = 2,871,968.39/2,086.50
6. Step 6: Final answer
   x = 1,376.45