Finding the Third Proportional to 64,578 and 139,051.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,578 : 139,051.50 = 139,051.50 : x
2. Step 2: Convert to fraction form
   64,578/139,051.50 = 139,051.50/x
3. Step 3: Cross multiply
   64,578x = 139,051.50 × 139,051.50
4. Step 4: Simplify right side
   64,578x = 19,335,319,652.25
5. Step 5: Solve for x
   x = 19,335,319,652.25/64,578
6. Step 6: Final answer
   x = 299,410.32