Finding the Third Proportional to 291,915 and 433,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,915 : 433,678.50 = 433,678.50 : x
2. Step 2: Convert to fraction form
   291,915/433,678.50 = 433,678.50/x
3. Step 3: Cross multiply
   291,915x = 433,678.50 × 433,678.50
4. Step 4: Simplify right side
   291,915x = 188,077,041,362.25
5. Step 5: Solve for x
   x = 188,077,041,362.25/291,915
6. Step 6: Final answer
   x = 644,287.01