Finding the Fourth Proportional to 9,319.78, 12,861.72 and 5,784.13

Step by Step Solution

1. Step 1: Write the proportion equation
   9,319.78 : 12,861.72 = 5,784.13 : x
2. Step 2: Convert to fraction form
   9,319.78/12,861.72 = 5,784.13/x
3. Step 3: Cross multiply
   9,319.78x = 12,861.72 × 5,784.13
4. Step 4: Simplify right side
   9,319.78x = 74,393,860.50
5. Step 5: Solve for x
   x = 74,393,860.50/9,319.78
6. Step 6: Final answer
   x = 7,982.36