Finding the Fourth Proportional to 1,407.33, 2,109.78 and 757.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.33 : 2,109.78 = 757.31 : x
2. Step 2: Convert to fraction form
   1,407.33/2,109.78 = 757.31/x
3. Step 3: Cross multiply
   1,407.33x = 2,109.78 × 757.31
4. Step 4: Simplify right side
   1,407.33x = 1,597,746.94
5. Step 5: Solve for x
   x = 1,597,746.94/1,407.33
6. Step 6: Final answer
   x = 1,135.30