Finding the Third Proportional to 2,145.35 and 4,428.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.35 : 4,428.46 = 4,428.46 : x
2. Step 2: Convert to fraction form
   2,145.35/4,428.46 = 4,428.46/x
3. Step 3: Cross multiply
   2,145.35x = 4,428.46 × 4,428.46
4. Step 4: Simplify right side
   2,145.35x = 19,611,270.60
5. Step 5: Solve for x
   x = 19,611,270.60/2,145.35
6. Step 6: Final answer
   x = 9,141.28