Finding the Third Proportional to 57,421.50 and 86,196

Step by Step Solution

1. Step 1: Write the proportion equation
   57,421.50 : 86,196 = 86,196 : x
2. Step 2: Convert to fraction form
   57,421.50/86,196 = 86,196/x
3. Step 3: Cross multiply
   57,421.50x = 86,196 × 86,196
4. Step 4: Simplify right side
   57,421.50x = 7,429,750,416
5. Step 5: Solve for x
   x = 7,429,750,416/57,421.50
6. Step 6: Final answer
   x = 129,389.70