Finding the Third Proportional to 138,403.69 and 300,818.81

Step by Step Solution

1. Step 1: Write the proportion equation
   138,403.69 : 300,818.81 = 300,818.81 : x
2. Step 2: Convert to fraction form
   138,403.69/300,818.81 = 300,818.81/x
3. Step 3: Cross multiply
   138,403.69x = 300,818.81 × 300,818.81
4. Step 4: Simplify right side
   138,403.69x = 90,491,957,953.91
5. Step 5: Solve for x
   x = 90,491,957,953.91/138,403.69
6. Step 6: Final answer
   x = 653,826.21