Finding the Fourth Proportional to 2,620.68, 3,928.50 and 1,059.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.68 : 3,928.50 = 1,059.72 : x
2. Step 2: Convert to fraction form
   2,620.68/3,928.50 = 1,059.72/x
3. Step 3: Cross multiply
   2,620.68x = 3,928.50 × 1,059.72
4. Step 4: Simplify right side
   2,620.68x = 4,163,110.02
5. Step 5: Solve for x
   x = 4,163,110.02/2,620.68
6. Step 6: Final answer
   x = 1,588.56