Finding the Third Proportional to 57,398.63 and 86,316.89

Step by Step Solution

1. Step 1: Write the proportion equation
   57,398.63 : 86,316.89 = 86,316.89 : x
2. Step 2: Convert to fraction form
   57,398.63/86,316.89 = 86,316.89/x
3. Step 3: Cross multiply
   57,398.63x = 86,316.89 × 86,316.89
4. Step 4: Simplify right side
   57,398.63x = 7,450,605,607.17
5. Step 5: Solve for x
   x = 7,450,605,607.17/57,398.63
6. Step 6: Final answer
   x = 129,804.60