Finding the Third Proportional to 391.88 and 1,030.69

Step by Step Solution

1. Step 1: Write the proportion equation
   391.88 : 1,030.69 = 1,030.69 : x
2. Step 2: Convert to fraction form
   391.88/1,030.69 = 1,030.69/x
3. Step 3: Cross multiply
   391.88x = 1,030.69 × 1,030.69
4. Step 4: Simplify right side
   391.88x = 1,062,316.72
5. Step 5: Solve for x
   x = 1,062,316.72/391.88
6. Step 6: Final answer
   x = 2,710.86