Finding the Third Proportional to 42,976.88 and 66,409.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,976.88 : 66,409.31 = 66,409.31 : x
2. Step 2: Convert to fraction form
   42,976.88/66,409.31 = 66,409.31/x
3. Step 3: Cross multiply
   42,976.88x = 66,409.31 × 66,409.31
4. Step 4: Simplify right side
   42,976.88x = 4,410,196,786.72
5. Step 5: Solve for x
   x = 4,410,196,786.72/42,976.88
6. Step 6: Final answer
   x = 102,617.90