Finding the Third Proportional to 54,031.50 and 86,813.50

Step by Step Solution

1. Step 1: Write the proportion equation
   54,031.50 : 86,813.50 = 86,813.50 : x
2. Step 2: Convert to fraction form
   54,031.50/86,813.50 = 86,813.50/x
3. Step 3: Cross multiply
   54,031.50x = 86,813.50 × 86,813.50
4. Step 4: Simplify right side
   54,031.50x = 7,536,583,782.25
5. Step 5: Solve for x
   x = 7,536,583,782.25/54,031.50
6. Step 6: Final answer
   x = 139,485.00