Finding the Fourth Proportional to 1,605.94, 2,216.20 and 907.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.94 : 2,216.20 = 907.31 : x
2. Step 2: Convert to fraction form
   1,605.94/2,216.20 = 907.31/x
3. Step 3: Cross multiply
   1,605.94x = 2,216.20 × 907.31
4. Step 4: Simplify right side
   1,605.94x = 2,010,783.69
5. Step 5: Solve for x
   x = 2,010,783.69/1,605.94
6. Step 6: Final answer
   x = 1,252.09