Finding the Fourth Proportional to 2,717.60, 4,076.72 and 985.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,717.60 : 4,076.72 = 985.76 : x
2. Step 2: Convert to fraction form
   2,717.60/4,076.72 = 985.76/x
3. Step 3: Cross multiply
   2,717.60x = 4,076.72 × 985.76
4. Step 4: Simplify right side
   2,717.60x = 4,018,667.51
5. Step 5: Solve for x
   x = 4,018,667.51/2,717.60
6. Step 6: Final answer
   x = 1,478.76