Finding the Fourth Proportional to 1,083.55, 1,621.69 and 901.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,083.55 : 1,621.69 = 901.31 : x
2. Step 2: Convert to fraction form
   1,083.55/1,621.69 = 901.31/x
3. Step 3: Cross multiply
   1,083.55x = 1,621.69 × 901.31
4. Step 4: Simplify right side
   1,083.55x = 1,461,640.91
5. Step 5: Solve for x
   x = 1,461,640.91/1,083.55
6. Step 6: Final answer
   x = 1,348.94