Finding the Third Proportional to 30,607.50 and 64,890

Step by Step Solution

1. Step 1: Write the proportion equation
   30,607.50 : 64,890 = 64,890 : x
2. Step 2: Convert to fraction form
   30,607.50/64,890 = 64,890/x
3. Step 3: Cross multiply
   30,607.50x = 64,890 × 64,890
4. Step 4: Simplify right side
   30,607.50x = 4,210,712,100
5. Step 5: Solve for x
   x = 4,210,712,100/30,607.50
6. Step 6: Final answer
   x = 137,571.25