Finding the Fourth Proportional to 9,169.87, 12,654.42 and 4,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,169.87 : 12,654.42 = 4,978.12 : x
2. Step 2: Convert to fraction form
   9,169.87/12,654.42 = 4,978.12/x
3. Step 3: Cross multiply
   9,169.87x = 12,654.42 × 4,978.12
4. Step 4: Simplify right side
   9,169.87x = 62,995,221.29
5. Step 5: Solve for x
   x = 62,995,221.29/9,169.87
6. Step 6: Final answer
   x = 6,869.81