Finding the Third Proportional to 139,422 and 210,432

Step by Step Solution

1. Step 1: Write the proportion equation
   139,422 : 210,432 = 210,432 : x
2. Step 2: Convert to fraction form
   139,422/210,432 = 210,432/x
3. Step 3: Cross multiply
   139,422x = 210,432 × 210,432
4. Step 4: Simplify right side
   139,422x = 44,281,626,624
5. Step 5: Solve for x
   x = 44,281,626,624/139,422
6. Step 6: Final answer
   x = 317,608.60