Finding the Third Proportional to 83,490 and 129,300

Step by Step Solution

1. Step 1: Write the proportion equation
   83,490 : 129,300 = 129,300 : x
2. Step 2: Convert to fraction form
   83,490/129,300 = 129,300/x
3. Step 3: Cross multiply
   83,490x = 129,300 × 129,300
4. Step 4: Simplify right side
   83,490x = 16,718,490,000
5. Step 5: Solve for x
   x = 16,718,490,000/83,490
6. Step 6: Final answer
   x = 200,245.42