Finding the Third Proportional to 77,672.81 and 103,815.56

Step by Step Solution

1. Step 1: Write the proportion equation
   77,672.81 : 103,815.56 = 103,815.56 : x
2. Step 2: Convert to fraction form
   77,672.81/103,815.56 = 103,815.56/x
3. Step 3: Cross multiply
   77,672.81x = 103,815.56 × 103,815.56
4. Step 4: Simplify right side
   77,672.81x = 10,777,671,017.19
5. Step 5: Solve for x
   x = 10,777,671,017.19/77,672.81
6. Step 6: Final answer
   x = 138,757.32