Finding the Third Proportional to 263,988 and 378,300.38

Step by Step Solution

1. Step 1: Write the proportion equation
   263,988 : 378,300.38 = 378,300.38 : x
2. Step 2: Convert to fraction form
   263,988/378,300.38 = 378,300.38/x
3. Step 3: Cross multiply
   263,988x = 378,300.38 × 378,300.38
4. Step 4: Simplify right side
   263,988x = 143,111,173,725.14
5. Step 5: Solve for x
   x = 143,111,173,725.14/263,988
6. Step 6: Final answer
   x = 542,112.42