Finding the Third Proportional to 135,900 and 290,499.75

Step by Step Solution

1. Step 1: Write the proportion equation
   135,900 : 290,499.75 = 290,499.75 : x
2. Step 2: Convert to fraction form
   135,900/290,499.75 = 290,499.75/x
3. Step 3: Cross multiply
   135,900x = 290,499.75 × 290,499.75
4. Step 4: Simplify right side
   135,900x = 84,390,104,750.06
5. Step 5: Solve for x
   x = 84,390,104,750.06/135,900
6. Step 6: Final answer
   x = 620,972.07