Finding the Fourth Proportional to 2,620.06, 3,930.02 and 771.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.06 : 3,930.02 = 771.10 : x
2. Step 2: Convert to fraction form
   2,620.06/3,930.02 = 771.10/x
3. Step 3: Cross multiply
   2,620.06x = 3,930.02 × 771.10
4. Step 4: Simplify right side
   2,620.06x = 3,030,438.42
5. Step 5: Solve for x
   x = 3,030,438.42/2,620.06
6. Step 6: Final answer
   x = 1,156.63