Finding the Fourth Proportional to 2,620.32, 3,931.01 and 771.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.32 : 3,931.01 = 771.49 : x
2. Step 2: Convert to fraction form
   2,620.32/3,931.01 = 771.49/x
3. Step 3: Cross multiply
   2,620.32x = 3,931.01 × 771.49
4. Step 4: Simplify right side
   2,620.32x = 3,032,734.90
5. Step 5: Solve for x
   x = 3,032,734.90/2,620.32
6. Step 6: Final answer
   x = 1,157.39