Finding the Third Proportional to 42,451.50 and 78,805.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,451.50 : 78,805.50 = 78,805.50 : x
2. Step 2: Convert to fraction form
   42,451.50/78,805.50 = 78,805.50/x
3. Step 3: Cross multiply
   42,451.50x = 78,805.50 × 78,805.50
4. Step 4: Simplify right side
   42,451.50x = 6,210,306,830.25
5. Step 5: Solve for x
   x = 6,210,306,830.25/42,451.50
6. Step 6: Final answer
   x = 146,291.81