Finding the Third Proportional to 221,117 and 350,691.50

Step by Step Solution

1. Step 1: Write the proportion equation
   221,117 : 350,691.50 = 350,691.50 : x
2. Step 2: Convert to fraction form
   221,117/350,691.50 = 350,691.50/x
3. Step 3: Cross multiply
   221,117x = 350,691.50 × 350,691.50
4. Step 4: Simplify right side
   221,117x = 122,984,528,172.25
5. Step 5: Solve for x
   x = 122,984,528,172.25/221,117
6. Step 6: Final answer
   x = 556,196.62