Finding the Third Proportional to 138,575.50 and 298,499.87

Step by Step Solution

1. Step 1: Write the proportion equation
   138,575.50 : 298,499.87 = 298,499.87 : x
2. Step 2: Convert to fraction form
   138,575.50/298,499.87 = 298,499.87/x
3. Step 3: Cross multiply
   138,575.50x = 298,499.87 × 298,499.87
4. Step 4: Simplify right side
   138,575.50x = 89,102,173,042.99
5. Step 5: Solve for x
   x = 89,102,173,042.99/138,575.50
6. Step 6: Final answer
   x = 642,986.50