Finding the Third Proportional to 212,620.50 and 342,585

Step by Step Solution

1. Step 1: Write the proportion equation
   212,620.50 : 342,585 = 342,585 : x
2. Step 2: Convert to fraction form
   212,620.50/342,585 = 342,585/x
3. Step 3: Cross multiply
   212,620.50x = 342,585 × 342,585
4. Step 4: Simplify right side
   212,620.50x = 117,364,482,225
5. Step 5: Solve for x
   x = 117,364,482,225/212,620.50
6. Step 6: Final answer
   x = 551,990.43