Finding the Third Proportional to 78,218 and 103,719

Step by Step Solution

1. Step 1: Write the proportion equation
   78,218 : 103,719 = 103,719 : x
2. Step 2: Convert to fraction form
   78,218/103,719 = 103,719/x
3. Step 3: Cross multiply
   78,218x = 103,719 × 103,719
4. Step 4: Simplify right side
   78,218x = 10,757,630,961
5. Step 5: Solve for x
   x = 10,757,630,961/78,218
6. Step 6: Final answer
   x = 137,533.96