Finding the Fourth Proportional to 3,784.88, 5,678.27 and 1,319.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.88 : 5,678.27 = 1,319.72 : x
2. Step 2: Convert to fraction form
   3,784.88/5,678.27 = 1,319.72/x
3. Step 3: Cross multiply
   3,784.88x = 5,678.27 × 1,319.72
4. Step 4: Simplify right side
   3,784.88x = 7,493,743.98
5. Step 5: Solve for x
   x = 7,493,743.98/3,784.88
6. Step 6: Final answer
   x = 1,979.91