Finding the Third Proportional to 291,326 and 393,604.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,326 : 393,604.50 = 393,604.50 : x
2. Step 2: Convert to fraction form
   291,326/393,604.50 = 393,604.50/x
3. Step 3: Cross multiply
   291,326x = 393,604.50 × 393,604.50
4. Step 4: Simplify right side
   291,326x = 154,924,502,420.25
5. Step 5: Solve for x
   x = 154,924,502,420.25/291,326
6. Step 6: Final answer
   x = 531,790.85