Finding the Third Proportional to 291,313.50 and 393,588

Step by Step Solution

1. Step 1: Write the proportion equation
   291,313.50 : 393,588 = 393,588 : x
2. Step 2: Convert to fraction form
   291,313.50/393,588 = 393,588/x
3. Step 3: Cross multiply
   291,313.50x = 393,588 × 393,588
4. Step 4: Simplify right side
   291,313.50x = 154,911,513,744
5. Step 5: Solve for x
   x = 154,911,513,744/291,313.50
6. Step 6: Final answer
   x = 531,769.09