Finding the Fourth Proportional to 1,676.72, 2,313.72 and 977.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,676.72 : 2,313.72 = 977.96 : x
2. Step 2: Convert to fraction form
   1,676.72/2,313.72 = 977.96/x
3. Step 3: Cross multiply
   1,676.72x = 2,313.72 × 977.96
4. Step 4: Simplify right side
   1,676.72x = 2,262,725.61
5. Step 5: Solve for x
   x = 2,262,725.61/1,676.72
6. Step 6: Final answer
   x = 1,349.50