Finding the Fourth Proportional to 8,969.31, 12,377.34 and 4,990.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,969.31 : 12,377.34 = 4,990.59 : x
2. Step 2: Convert to fraction form
   8,969.31/12,377.34 = 4,990.59/x
3. Step 3: Cross multiply
   8,969.31x = 12,377.34 × 4,990.59
4. Step 4: Simplify right side
   8,969.31x = 61,770,229.23
5. Step 5: Solve for x
   x = 61,770,229.23/8,969.31
6. Step 6: Final answer
   x = 6,886.84