Finding the Third Proportional to 155,439 and 342,190.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,439 : 342,190.50 = 342,190.50 : x
2. Step 2: Convert to fraction form
   155,439/342,190.50 = 342,190.50/x
3. Step 3: Cross multiply
   155,439x = 342,190.50 × 342,190.50
4. Step 4: Simplify right side
   155,439x = 117,094,338,290.25
5. Step 5: Solve for x
   x = 117,094,338,290.25/155,439
6. Step 6: Final answer
   x = 753,313.76