Finding the Fourth Proportional to 1,605.86, 2,216.13 and 907.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,605.86 : 2,216.13 = 907.22 : x
2. Step 2: Convert to fraction form
   1,605.86/2,216.13 = 907.22/x
3. Step 3: Cross multiply
   1,605.86x = 2,216.13 × 907.22
4. Step 4: Simplify right side
   1,605.86x = 2,010,517.46
5. Step 5: Solve for x
   x = 2,010,517.46/1,605.86
6. Step 6: Final answer
   x = 1,251.99