Finding the Third Proportional to 56,683.50 and 85,663.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,683.50 : 85,663.50 = 85,663.50 : x
2. Step 2: Convert to fraction form
   56,683.50/85,663.50 = 85,663.50/x
3. Step 3: Cross multiply
   56,683.50x = 85,663.50 × 85,663.50
4. Step 4: Simplify right side
   56,683.50x = 7,338,235,232.25
5. Step 5: Solve for x
   x = 7,338,235,232.25/56,683.50
6. Step 6: Final answer
   x = 129,459.81