Finding the Fourth Proportional to 1,222.76, 1,687.38 and 907.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,222.76 : 1,687.38 = 907.94 : x
2. Step 2: Convert to fraction form
   1,222.76/1,687.38 = 907.94/x
3. Step 3: Cross multiply
   1,222.76x = 1,687.38 × 907.94
4. Step 4: Simplify right side
   1,222.76x = 1,532,039.80
5. Step 5: Solve for x
   x = 1,532,039.80/1,222.76
6. Step 6: Final answer
   x = 1,252.94