Finding the Third Proportional to 999.56 and 2,143.69

Step by Step Solution

1. Step 1: Write the proportion equation
   999.56 : 2,143.69 = 2,143.69 : x
2. Step 2: Convert to fraction form
   999.56/2,143.69 = 2,143.69/x
3. Step 3: Cross multiply
   999.56x = 2,143.69 × 2,143.69
4. Step 4: Simplify right side
   999.56x = 4,595,396.10
5. Step 5: Solve for x
   x = 4,595,396.10/999.56
6. Step 6: Final answer
   x = 4,597.41