Finding the Third Proportional to 156,909.50 and 342,976.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,909.50 : 342,976.50 = 342,976.50 : x
2. Step 2: Convert to fraction form
   156,909.50/342,976.50 = 342,976.50/x
3. Step 3: Cross multiply
   156,909.50x = 342,976.50 × 342,976.50
4. Step 4: Simplify right side
   156,909.50x = 117,632,879,552.25
5. Step 5: Solve for x
   x = 117,632,879,552.25/156,909.50
6. Step 6: Final answer
   x = 749,686.15