Finding the Fourth Proportional to 1,607.96, 2,218.32 and 978.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,607.96 : 2,218.32 = 978.26 : x
2. Step 2: Convert to fraction form
   1,607.96/2,218.32 = 978.26/x
3. Step 3: Cross multiply
   1,607.96x = 2,218.32 × 978.26
4. Step 4: Simplify right side
   1,607.96x = 2,170,093.72
5. Step 5: Solve for x
   x = 2,170,093.72/1,607.96
6. Step 6: Final answer
   x = 1,349.59