Finding the Fourth Proportional to 5,078.72, 7,618.12 and 1,380.96

Step by Step Solution

1. Step 1: Write the proportion equation
   5,078.72 : 7,618.12 = 1,380.96 : x
2. Step 2: Convert to fraction form
   5,078.72/7,618.12 = 1,380.96/x
3. Step 3: Cross multiply
   5,078.72x = 7,618.12 × 1,380.96
4. Step 4: Simplify right side
   5,078.72x = 10,520,319.00
5. Step 5: Solve for x
   x = 10,520,319.00/5,078.72
6. Step 6: Final answer
   x = 2,071.45