Finding the Fourth Proportional to 2,515.80, 3,774.24 and 1,054.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,515.80 : 3,774.24 = 1,054.20 : x
2. Step 2: Convert to fraction form
   2,515.80/3,774.24 = 1,054.20/x
3. Step 3: Cross multiply
   2,515.80x = 3,774.24 × 1,054.20
4. Step 4: Simplify right side
   2,515.80x = 3,978,803.81
5. Step 5: Solve for x
   x = 3,978,803.81/2,515.80
6. Step 6: Final answer
   x = 1,581.53