Finding the Fourth Proportional to 8,969.31, 12,376.17 and 4,990.32

Step by Step Solution

1. Step 1: Write the proportion equation
   8,969.31 : 12,376.17 = 4,990.32 : x
2. Step 2: Convert to fraction form
   8,969.31/12,376.17 = 4,990.32/x
3. Step 3: Cross multiply
   8,969.31x = 12,376.17 × 4,990.32
4. Step 4: Simplify right side
   8,969.31x = 61,761,048.67
5. Step 5: Solve for x
   x = 61,761,048.67/8,969.31
6. Step 6: Final answer
   x = 6,885.82