Finding the Third Proportional to 55,438.17 and 86,866.17

Step by Step Solution

1. Step 1: Write the proportion equation
   55,438.17 : 86,866.17 = 86,866.17 : x
2. Step 2: Convert to fraction form
   55,438.17/86,866.17 = 86,866.17/x
3. Step 3: Cross multiply
   55,438.17x = 86,866.17 × 86,866.17
4. Step 4: Simplify right side
   55,438.17x = 7,545,731,816.22
5. Step 5: Solve for x
   x = 7,545,731,816.22/55,438.17
6. Step 6: Final answer
   x = 136,110.76