Finding the Third Proportional to 156,109.50 and 328,531.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,109.50 : 328,531.50 = 328,531.50 : x
2. Step 2: Convert to fraction form
   156,109.50/328,531.50 = 328,531.50/x
3. Step 3: Cross multiply
   156,109.50x = 328,531.50 × 328,531.50
4. Step 4: Simplify right side
   156,109.50x = 107,932,946,492.25
5. Step 5: Solve for x
   x = 107,932,946,492.25/156,109.50
6. Step 6: Final answer
   x = 691,392.56