Finding the Third Proportional to 30,158 and 64,688

Step by Step Solution

1. Step 1: Write the proportion equation
   30,158 : 64,688 = 64,688 : x
2. Step 2: Convert to fraction form
   30,158/64,688 = 64,688/x
3. Step 3: Cross multiply
   30,158x = 64,688 × 64,688
4. Step 4: Simplify right side
   30,158x = 4,184,537,344
5. Step 5: Solve for x
   x = 4,184,537,344/30,158
6. Step 6: Final answer
   x = 138,753.81