Finding the Fourth Proportional to 1,783.16, 2,676.18 and 917.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,783.16 : 2,676.18 = 917.72 : x
2. Step 2: Convert to fraction form
   1,783.16/2,676.18 = 917.72/x
3. Step 3: Cross multiply
   1,783.16x = 2,676.18 × 917.72
4. Step 4: Simplify right side
   1,783.16x = 2,455,983.91
5. Step 5: Solve for x
   x = 2,455,983.91/1,783.16
6. Step 6: Final answer
   x = 1,377.32