Finding the Third Proportional to 190,111.50 and 415,280.50

Step by Step Solution

1. Step 1: Write the proportion equation
   190,111.50 : 415,280.50 = 415,280.50 : x
2. Step 2: Convert to fraction form
   190,111.50/415,280.50 = 415,280.50/x
3. Step 3: Cross multiply
   190,111.50x = 415,280.50 × 415,280.50
4. Step 4: Simplify right side
   190,111.50x = 172,457,893,680.25
5. Step 5: Solve for x
   x = 172,457,893,680.25/190,111.50
6. Step 6: Final answer
   x = 907,140.78