Finding the Third Proportional to 249,064 and 389,149.50

Step by Step Solution

1. Step 1: Write the proportion equation
   249,064 : 389,149.50 = 389,149.50 : x
2. Step 2: Convert to fraction form
   249,064/389,149.50 = 389,149.50/x
3. Step 3: Cross multiply
   249,064x = 389,149.50 × 389,149.50
4. Step 4: Simplify right side
   249,064x = 151,437,333,350.25
5. Step 5: Solve for x
   x = 151,437,333,350.25/249,064
6. Step 6: Final answer
   x = 608,025.78