Finding the Fourth Proportional to 2,621.68, 3,930.06 and 977.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.68 : 3,930.06 = 977.82 : x
2. Step 2: Convert to fraction form
   2,621.68/3,930.06 = 977.82/x
3. Step 3: Cross multiply
   2,621.68x = 3,930.06 × 977.82
4. Step 4: Simplify right side
   2,621.68x = 3,842,891.27
5. Step 5: Solve for x
   x = 3,842,891.27/2,621.68
6. Step 6: Final answer
   x = 1,465.81