Finding the Third Proportional to 129,630 and 211,672.50

Step by Step Solution

1. Step 1: Write the proportion equation
   129,630 : 211,672.50 = 211,672.50 : x
2. Step 2: Convert to fraction form
   129,630/211,672.50 = 211,672.50/x
3. Step 3: Cross multiply
   129,630x = 211,672.50 × 211,672.50
4. Step 4: Simplify right side
   129,630x = 44,805,247,256.25
5. Step 5: Solve for x
   x = 44,805,247,256.25/129,630
6. Step 6: Final answer
   x = 345,639.49