Finding the Third Proportional to 71,300 and 99,688

Step by Step Solution

1. Step 1: Write the proportion equation
   71,300 : 99,688 = 99,688 : x
2. Step 2: Convert to fraction form
   71,300/99,688 = 99,688/x
3. Step 3: Cross multiply
   71,300x = 99,688 × 99,688
4. Step 4: Simplify right side
   71,300x = 9,937,697,344
5. Step 5: Solve for x
   x = 9,937,697,344/71,300
6. Step 6: Final answer
   x = 139,378.64