Finding the Third Proportional to 57,438.50 and 85,813.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,438.50 : 85,813.50 = 85,813.50 : x
2. Step 2: Convert to fraction form
   57,438.50/85,813.50 = 85,813.50/x
3. Step 3: Cross multiply
   57,438.50x = 85,813.50 × 85,813.50
4. Step 4: Simplify right side
   57,438.50x = 7,363,956,782.25
5. Step 5: Solve for x
   x = 7,363,956,782.25/57,438.50
6. Step 6: Final answer
   x = 128,205.94