Finding the Third Proportional to 21,125.81 and 42,836.34

Step by Step Solution

1. Step 1: Write the proportion equation
   21,125.81 : 42,836.34 = 42,836.34 : x
2. Step 2: Convert to fraction form
   21,125.81/42,836.34 = 42,836.34/x
3. Step 3: Cross multiply
   21,125.81x = 42,836.34 × 42,836.34
4. Step 4: Simplify right side
   21,125.81x = 1,834,952,345.87
5. Step 5: Solve for x
   x = 1,834,952,345.87/21,125.81
6. Step 6: Final answer
   x = 86,858.31