Finding the Third Proportional to 91,152 and 139,920

Step by Step Solution

1. Step 1: Write the proportion equation
   91,152 : 139,920 = 139,920 : x
2. Step 2: Convert to fraction form
   91,152/139,920 = 139,920/x
3. Step 3: Cross multiply
   91,152x = 139,920 × 139,920
4. Step 4: Simplify right side
   91,152x = 19,577,606,400
5. Step 5: Solve for x
   x = 19,577,606,400/91,152
6. Step 6: Final answer
   x = 214,779.78