Finding the Third Proportional to 138,939 and 215,272.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,939 : 215,272.50 = 215,272.50 : x
2. Step 2: Convert to fraction form
   138,939/215,272.50 = 215,272.50/x
3. Step 3: Cross multiply
   138,939x = 215,272.50 × 215,272.50
4. Step 4: Simplify right side
   138,939x = 46,342,249,256.25
5. Step 5: Solve for x
   x = 46,342,249,256.25/138,939
6. Step 6: Final answer
   x = 333,543.85