Finding the Fourth Proportional to 1,405.33, 1,938.98 and 907.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.33 : 1,938.98 = 907.79 : x
2. Step 2: Convert to fraction form
   1,405.33/1,938.98 = 907.79/x
3. Step 3: Cross multiply
   1,405.33x = 1,938.98 × 907.79
4. Step 4: Simplify right side
   1,405.33x = 1,760,179.54
5. Step 5: Solve for x
   x = 1,760,179.54/1,405.33
6. Step 6: Final answer
   x = 1,252.50