Finding the Third Proportional to 201,917 and 312,611.50

Step by Step Solution

1. Step 1: Write the proportion equation
   201,917 : 312,611.50 = 312,611.50 : x
2. Step 2: Convert to fraction form
   201,917/312,611.50 = 312,611.50/x
3. Step 3: Cross multiply
   201,917x = 312,611.50 × 312,611.50
4. Step 4: Simplify right side
   201,917x = 97,725,949,932.25
5. Step 5: Solve for x
   x = 97,725,949,932.25/201,917
6. Step 6: Final answer
   x = 483,990.70