Finding the Third Proportional to 53,672.63 and 81,921.38

Step by Step Solution

1. Step 1: Write the proportion equation
   53,672.63 : 81,921.38 = 81,921.38 : x
2. Step 2: Convert to fraction form
   53,672.63/81,921.38 = 81,921.38/x
3. Step 3: Cross multiply
   53,672.63x = 81,921.38 × 81,921.38
4. Step 4: Simplify right side
   53,672.63x = 6,711,111,681.89
5. Step 5: Solve for x
   x = 6,711,111,681.89/53,672.63
6. Step 6: Final answer
   x = 125,037.89