Finding the Third Proportional to 860.63 and 1,990.69

Step by Step Solution

1. Step 1: Write the proportion equation
   860.63 : 1,990.69 = 1,990.69 : x
2. Step 2: Convert to fraction form
   860.63/1,990.69 = 1,990.69/x
3. Step 3: Cross multiply
   860.63x = 1,990.69 × 1,990.69
4. Step 4: Simplify right side
   860.63x = 3,962,836.72
5. Step 5: Solve for x
   x = 3,962,836.72/860.63
6. Step 6: Final answer
   x = 4,604.60