Finding the Fourth Proportional to 2,210.31, 3,316.62 and 978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.31 : 3,316.62 = 978.57 : x
2. Step 2: Convert to fraction form
   2,210.31/3,316.62 = 978.57/x
3. Step 3: Cross multiply
   2,210.31x = 3,316.62 × 978.57
4. Step 4: Simplify right side
   2,210.31x = 3,245,544.83
5. Step 5: Solve for x
   x = 3,245,544.83/2,210.31
6. Step 6: Final answer
   x = 1,468.37