Finding the Fourth Proportional to 1,913.31, 2,640.50 and 1,167.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,913.31 : 2,640.50 = 1,167.07 : x
2. Step 2: Convert to fraction form
   1,913.31/2,640.50 = 1,167.07/x
3. Step 3: Cross multiply
   1,913.31x = 2,640.50 × 1,167.07
4. Step 4: Simplify right side
   1,913.31x = 3,081,629.30
5. Step 5: Solve for x
   x = 3,081,629.30/1,913.31
6. Step 6: Final answer
   x = 1,610.63