Finding the Third Proportional to 15,942.75 and 21,427.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,942.75 : 21,427.50 = 21,427.50 : x
2. Step 2: Convert to fraction form
   15,942.75/21,427.50 = 21,427.50/x
3. Step 3: Cross multiply
   15,942.75x = 21,427.50 × 21,427.50
4. Step 4: Simplify right side
   15,942.75x = 459,137,756.25
5. Step 5: Solve for x
   x = 459,137,756.25/15,942.75
6. Step 6: Final answer
   x = 28,799.16