Finding the Fourth Proportional to 1,607.93, 2,219.30 and 978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.93 : 2,219.30 = 978.33 : x
2. Step 2: Convert to fraction form
   1,607.93/2,219.30 = 978.33/x
3. Step 3: Cross multiply
   1,607.93x = 2,219.30 × 978.33
4. Step 4: Simplify right side
   1,607.93x = 2,171,196.67
5. Step 5: Solve for x
   x = 2,171,196.67/1,607.93
6. Step 6: Final answer
   x = 1,350.31