Finding the Third Proportional to 45,420 and 70,890

Step by Step Solution

1. Step 1: Write the proportion equation
   45,420 : 70,890 = 70,890 : x
2. Step 2: Convert to fraction form
   45,420/70,890 = 70,890/x
3. Step 3: Cross multiply
   45,420x = 70,890 × 70,890
4. Step 4: Simplify right side
   45,420x = 5,025,392,100
5. Step 5: Solve for x
   x = 5,025,392,100/45,420
6. Step 6: Final answer
   x = 110,642.71