Finding the Third Proportional to 85,440 and 134,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85,440 : 134,221.50 = 134,221.50 : x
2. Step 2: Convert to fraction form
   85,440/134,221.50 = 134,221.50/x
3. Step 3: Cross multiply
   85,440x = 134,221.50 × 134,221.50
4. Step 4: Simplify right side
   85,440x = 18,015,411,062.25
5. Step 5: Solve for x
   x = 18,015,411,062.25/85,440
6. Step 6: Final answer
   x = 210,854.53