Finding the Third Proportional to 276,699 and 388,588.50

Step by Step Solution

1. Step 1: Write the proportion equation
   276,699 : 388,588.50 = 388,588.50 : x
2. Step 2: Convert to fraction form
   276,699/388,588.50 = 388,588.50/x
3. Step 3: Cross multiply
   276,699x = 388,588.50 × 388,588.50
4. Step 4: Simplify right side
   276,699x = 151,001,022,332.25
5. Step 5: Solve for x
   x = 151,001,022,332.25/276,699
6. Step 6: Final answer
   x = 545,723.05