Finding the Fourth Proportional to 3,784.78, 5,679.78 and 1,319.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.78 : 5,679.78 = 1,319.62 : x
2. Step 2: Convert to fraction form
   3,784.78/5,679.78 = 1,319.62/x
3. Step 3: Cross multiply
   3,784.78x = 5,679.78 × 1,319.62
4. Step 4: Simplify right side
   3,784.78x = 7,495,151.28
5. Step 5: Solve for x
   x = 7,495,151.28/3,784.78
6. Step 6: Final answer
   x = 1,980.34