Finding the Fourth Proportional to 5,091.40, 7,629.90 and 3,764.80

Step by Step Solution

1. Step 1: Write the proportion equation
   5,091.40 : 7,629.90 = 3,764.80 : x
2. Step 2: Convert to fraction form
   5,091.40/7,629.90 = 3,764.80/x
3. Step 3: Cross multiply
   5,091.40x = 7,629.90 × 3,764.80
4. Step 4: Simplify right side
   5,091.40x = 28,725,047.52
5. Step 5: Solve for x
   x = 28,725,047.52/5,091.40
6. Step 6: Final answer
   x = 5,641.88