Finding the Third Proportional to 1,921.50 and 4,072.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.50 : 4,072.50 = 4,072.50 : x
2. Step 2: Convert to fraction form
   1,921.50/4,072.50 = 4,072.50/x
3. Step 3: Cross multiply
   1,921.50x = 4,072.50 × 4,072.50
4. Step 4: Simplify right side
   1,921.50x = 16,585,256.25
5. Step 5: Solve for x
   x = 16,585,256.25/1,921.50
6. Step 6: Final answer
   x = 8,631.41