Finding the Fourth Proportional to 1,300.21, 1,794.31 and 710.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.21 : 1,794.31 = 710.80 : x
2. Step 2: Convert to fraction form
   1,300.21/1,794.31 = 710.80/x
3. Step 3: Cross multiply
   1,300.21x = 1,794.31 × 710.80
4. Step 4: Simplify right side
   1,300.21x = 1,275,389.29
5. Step 5: Solve for x
   x = 1,275,389.29/1,300.21
6. Step 6: Final answer
   x = 980.91