Finding the Fourth Proportional to 6,116.90, 8,438.42 and 4,128.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,116.90 : 8,438.42 = 4,128.09 : x
2. Step 2: Convert to fraction form
   6,116.90/8,438.42 = 4,128.09/x
3. Step 3: Cross multiply
   6,116.90x = 8,438.42 × 4,128.09
4. Step 4: Simplify right side
   6,116.90x = 34,834,536.58
5. Step 5: Solve for x
   x = 34,834,536.58/6,116.90
6. Step 6: Final answer
   x = 5,694.81