Finding the Fourth Proportional to 2,621.76, 3,931.41 and 978.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.76 : 3,931.41 = 978.27 : x
2. Step 2: Convert to fraction form
   2,621.76/3,931.41 = 978.27/x
3. Step 3: Cross multiply
   2,621.76x = 3,931.41 × 978.27
4. Step 4: Simplify right side
   2,621.76x = 3,845,980.46
5. Step 5: Solve for x
   x = 3,845,980.46/2,621.76
6. Step 6: Final answer
   x = 1,466.95