Finding the Fourth Proportional to 1,811.31, 2,499.61 and 983.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,811.31 : 2,499.61 = 983.31 : x
2. Step 2: Convert to fraction form
   1,811.31/2,499.61 = 983.31/x
3. Step 3: Cross multiply
   1,811.31x = 2,499.61 × 983.31
4. Step 4: Simplify right side
   1,811.31x = 2,457,891.51
5. Step 5: Solve for x
   x = 2,457,891.51/1,811.31
6. Step 6: Final answer
   x = 1,356.97