Finding the Fourth Proportional to 1,501.50, 2,072.28 and 978.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.50 : 2,072.28 = 978.66 : x
2. Step 2: Convert to fraction form
   1,501.50/2,072.28 = 978.66/x
3. Step 3: Cross multiply
   1,501.50x = 2,072.28 × 978.66
4. Step 4: Simplify right side
   1,501.50x = 2,028,057.54
5. Step 5: Solve for x
   x = 2,028,057.54/1,501.50
6. Step 6: Final answer
   x = 1,350.69