Finding the Fourth Proportional to 1,676.16, 2,313.72 and 978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,676.16 : 2,313.72 = 978.12 : x
2. Step 2: Convert to fraction form
   1,676.16/2,313.72 = 978.12/x
3. Step 3: Cross multiply
   1,676.16x = 2,313.72 × 978.12
4. Step 4: Simplify right side
   1,676.16x = 2,263,095.81
5. Step 5: Solve for x
   x = 2,263,095.81/1,676.16
6. Step 6: Final answer
   x = 1,350.17