Finding the Third Proportional to 28,670 and 64,390

Step by Step Solution

1. Step 1: Write the proportion equation
   28,670 : 64,390 = 64,390 : x
2. Step 2: Convert to fraction form
   28,670/64,390 = 64,390/x
3. Step 3: Cross multiply
   28,670x = 64,390 × 64,390
4. Step 4: Simplify right side
   28,670x = 4,146,072,100
5. Step 5: Solve for x
   x = 4,146,072,100/28,670
6. Step 6: Final answer
   x = 144,613.61