Finding the Fourth Proportional to 1,405.06, 1,938.57 and 907.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.06 : 1,938.57 = 907.99 : x
2. Step 2: Convert to fraction form
   1,405.06/1,938.57 = 907.99/x
3. Step 3: Cross multiply
   1,405.06x = 1,938.57 × 907.99
4. Step 4: Simplify right side
   1,405.06x = 1,760,202.17
5. Step 5: Solve for x
   x = 1,760,202.17/1,405.06
6. Step 6: Final answer
   x = 1,252.76