Finding the Fourth Proportional to 2,621.40, 3,932.60 and 977.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,621.40 : 3,932.60 = 977.88 : x
2. Step 2: Convert to fraction form
   2,621.40/3,932.60 = 977.88/x
3. Step 3: Cross multiply
   2,621.40x = 3,932.60 × 977.88
4. Step 4: Simplify right side
   2,621.40x = 3,845,610.89
5. Step 5: Solve for x
   x = 3,845,610.89/2,621.40
6. Step 6: Final answer
   x = 1,467.01