Finding the Fourth Proportional to 8,978.49, 13,466.13 and 3,136.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.49 : 13,466.13 = 3,136.77 : x
2. Step 2: Convert to fraction form
   8,978.49/13,466.13 = 3,136.77/x
3. Step 3: Cross multiply
   8,978.49x = 13,466.13 × 3,136.77
4. Step 4: Simplify right side
   8,978.49x = 42,240,152.60
5. Step 5: Solve for x
   x = 42,240,152.60/8,978.49
6. Step 6: Final answer
   x = 4,704.59