Finding the Fourth Proportional to 2,086.02, 3,129.30 and 931.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.02 : 3,129.30 = 931.50 : x
2. Step 2: Convert to fraction form
   2,086.02/3,129.30 = 931.50/x
3. Step 3: Cross multiply
   2,086.02x = 3,129.30 × 931.50
4. Step 4: Simplify right side
   2,086.02x = 2,914,942.95
5. Step 5: Solve for x
   x = 2,914,942.95/2,086.02
6. Step 6: Final answer
   x = 1,397.37