Finding the Third Proportional to 28,870 and 63,405

Step by Step Solution

1. Step 1: Write the proportion equation
   28,870 : 63,405 = 63,405 : x
2. Step 2: Convert to fraction form
   28,870/63,405 = 63,405/x
3. Step 3: Cross multiply
   28,870x = 63,405 × 63,405
4. Step 4: Simplify right side
   28,870x = 4,020,194,025
5. Step 5: Solve for x
   x = 4,020,194,025/28,870
6. Step 6: Final answer
   x = 139,251.61