Finding the Fourth Proportional to 1,650.21, 2,277.60 and 978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,650.21 : 2,277.60 = 978.15 : x
2. Step 2: Convert to fraction form
   1,650.21/2,277.60 = 978.15/x
3. Step 3: Cross multiply
   1,650.21x = 2,277.60 × 978.15
4. Step 4: Simplify right side
   1,650.21x = 2,227,834.44
5. Step 5: Solve for x
   x = 2,227,834.44/1,650.21
6. Step 6: Final answer
   x = 1,350.03