Finding the Fourth Proportional to 1,040.48, 1,434.69 and 709.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.48 : 1,434.69 = 709.10 : x
2. Step 2: Convert to fraction form
   1,040.48/1,434.69 = 709.10/x
3. Step 3: Cross multiply
   1,040.48x = 1,434.69 × 709.10
4. Step 4: Simplify right side
   1,040.48x = 1,017,331.51
5. Step 5: Solve for x
   x = 1,017,331.51/1,040.48
6. Step 6: Final answer
   x = 977.76