Finding the Third Proportional to 61,172.72 and 86,146.03

Step by Step Solution

1. Step 1: Write the proportion equation
   61,172.72 : 86,146.03 = 86,146.03 : x
2. Step 2: Convert to fraction form
   61,172.72/86,146.03 = 86,146.03/x
3. Step 3: Cross multiply
   61,172.72x = 86,146.03 × 86,146.03
4. Step 4: Simplify right side
   61,172.72x = 7,421,138,700.13
5. Step 5: Solve for x
   x = 7,421,138,700.13/61,172.72
6. Step 6: Final answer
   x = 121,314.51