Finding the Third Proportional to 21,012.75 and 30,142.13

Step by Step Solution

1. Step 1: Write the proportion equation
   21,012.75 : 30,142.13 = 30,142.13 : x
2. Step 2: Convert to fraction form
   21,012.75/30,142.13 = 30,142.13/x
3. Step 3: Cross multiply
   21,012.75x = 30,142.13 × 30,142.13
4. Step 4: Simplify right side
   21,012.75x = 908,547,699.52
5. Step 5: Solve for x
   x = 908,547,699.52/21,012.75
6. Step 6: Final answer
   x = 43,237.92