Finding the Fourth Proportional to 8,990.73, 13,488.53 and 3,147.80

Step by Step Solution

1. Step 1: Write the proportion equation
   8,990.73 : 13,488.53 = 3,147.80 : x
2. Step 2: Convert to fraction form
   8,990.73/13,488.53 = 3,147.80/x
3. Step 3: Cross multiply
   8,990.73x = 13,488.53 × 3,147.80
4. Step 4: Simplify right side
   8,990.73x = 42,459,111.55
5. Step 5: Solve for x
   x = 42,459,111.55/8,990.73
6. Step 6: Final answer
   x = 4,722.54