Finding the Third Proportional to 64,939.50 and 139,572

Step by Step Solution

1. Step 1: Write the proportion equation
   64,939.50 : 139,572 = 139,572 : x
2. Step 2: Convert to fraction form
   64,939.50/139,572 = 139,572/x
3. Step 3: Cross multiply
   64,939.50x = 139,572 × 139,572
4. Step 4: Simplify right side
   64,939.50x = 19,480,343,184
5. Step 5: Solve for x
   x = 19,480,343,184/64,939.50
6. Step 6: Final answer
   x = 299,976.80