Finding the Third Proportional to 89,931.38 and 138,393.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89,931.38 : 138,393.56 = 138,393.56 : x
2. Step 2: Convert to fraction form
   89,931.38/138,393.56 = 138,393.56/x
3. Step 3: Cross multiply
   89,931.38x = 138,393.56 × 138,393.56
4. Step 4: Simplify right side
   89,931.38x = 19,152,778,141.44
5. Step 5: Solve for x
   x = 19,152,778,141.44/89,931.38
6. Step 6: Final answer
   x = 212,971.04