Finding the Third Proportional to 30,778.69 and 66,155.06

Step by Step Solution

1. Step 1: Write the proportion equation
   30,778.69 : 66,155.06 = 66,155.06 : x
2. Step 2: Convert to fraction form
   30,778.69/66,155.06 = 66,155.06/x
3. Step 3: Cross multiply
   30,778.69x = 66,155.06 × 66,155.06
4. Step 4: Simplify right side
   30,778.69x = 4,376,492,294.38
5. Step 5: Solve for x
   x = 4,376,492,294.38/30,778.69
6. Step 6: Final answer
   x = 142,192.30