Finding the Third Proportional to 78,900 and 110,978

Step by Step Solution

1. Step 1: Write the proportion equation
   78,900 : 110,978 = 110,978 : x
2. Step 2: Convert to fraction form
   78,900/110,978 = 110,978/x
3. Step 3: Cross multiply
   78,900x = 110,978 × 110,978
4. Step 4: Simplify right side
   78,900x = 12,316,116,484
5. Step 5: Solve for x
   x = 12,316,116,484/78,900
6. Step 6: Final answer
   x = 156,097.80