Finding the Third Proportional to 138,421.50 and 300,855

Step by Step Solution

1. Step 1: Write the proportion equation
   138,421.50 : 300,855 = 300,855 : x
2. Step 2: Convert to fraction form
   138,421.50/300,855 = 300,855/x
3. Step 3: Cross multiply
   138,421.50x = 300,855 × 300,855
4. Step 4: Simplify right side
   138,421.50x = 90,513,731,025
5. Step 5: Solve for x
   x = 90,513,731,025/138,421.50
6. Step 6: Final answer
   x = 653,899.37