Finding the Third Proportional to 138,458.50 and 302,543

Step by Step Solution

1. Step 1: Write the proportion equation
   138,458.50 : 302,543 = 302,543 : x
2. Step 2: Convert to fraction form
   138,458.50/302,543 = 302,543/x
3. Step 3: Cross multiply
   138,458.50x = 302,543 × 302,543
4. Step 4: Simplify right side
   138,458.50x = 91,532,266,849
5. Step 5: Solve for x
   x = 91,532,266,849/138,458.50
6. Step 6: Final answer
   x = 661,080.88