Finding the Third Proportional to 310,900.50 and 645,174

Step by Step Solution

1. Step 1: Write the proportion equation
   310,900.50 : 645,174 = 645,174 : x
2. Step 2: Convert to fraction form
   310,900.50/645,174 = 645,174/x
3. Step 3: Cross multiply
   310,900.50x = 645,174 × 645,174
4. Step 4: Simplify right side
   310,900.50x = 416,249,490,276
5. Step 5: Solve for x
   x = 416,249,490,276/310,900.50
6. Step 6: Final answer
   x = 1,338,851.14