Finding the Third Proportional to 420,167 and 612,196.50

Step by Step Solution

1. Step 1: Write the proportion equation
   420,167 : 612,196.50 = 612,196.50 : x
2. Step 2: Convert to fraction form
   420,167/612,196.50 = 612,196.50/x
3. Step 3: Cross multiply
   420,167x = 612,196.50 × 612,196.50
4. Step 4: Simplify right side
   420,167x = 374,784,554,612.25
5. Step 5: Solve for x
   x = 374,784,554,612.25/420,167
6. Step 6: Final answer
   x = 891,989.51