Finding the Fourth Proportional to 9,870.48, 13,621.59 and 5,678.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,870.48 : 13,621.59 = 5,678.73 : x
2. Step 2: Convert to fraction form
   9,870.48/13,621.59 = 5,678.73/x
3. Step 3: Cross multiply
   9,870.48x = 13,621.59 × 5,678.73
4. Step 4: Simplify right side
   9,870.48x = 77,353,331.78
5. Step 5: Solve for x
   x = 77,353,331.78/9,870.48
6. Step 6: Final answer
   x = 7,836.84