Finding the Third Proportional to 138,528 and 298,241.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,528 : 298,241.50 = 298,241.50 : x
2. Step 2: Convert to fraction form
   138,528/298,241.50 = 298,241.50/x
3. Step 3: Cross multiply
   138,528x = 298,241.50 × 298,241.50
4. Step 4: Simplify right side
   138,528x = 88,947,992,322.25
5. Step 5: Solve for x
   x = 88,947,992,322.25/138,528
6. Step 6: Final answer
   x = 642,093.96