Finding the Third Proportional to 21,870 and 28,977.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,870 : 28,977.75 = 28,977.75 : x
2. Step 2: Convert to fraction form
   21,870/28,977.75 = 28,977.75/x
3. Step 3: Cross multiply
   21,870x = 28,977.75 × 28,977.75
4. Step 4: Simplify right side
   21,870x = 839,709,995.06
5. Step 5: Solve for x
   x = 839,709,995.06/21,870
6. Step 6: Final answer
   x = 38,395.52