Finding the Third Proportional to 38,128 and 56,640

Step by Step Solution

1. Step 1: Write the proportion equation
   38,128 : 56,640 = 56,640 : x
2. Step 2: Convert to fraction form
   38,128/56,640 = 56,640/x
3. Step 3: Cross multiply
   38,128x = 56,640 × 56,640
4. Step 4: Simplify right side
   38,128x = 3,208,089,600
5. Step 5: Solve for x
   x = 3,208,089,600/38,128
6. Step 6: Final answer
   x = 84,139.99