Finding the Fourth Proportional to 9,090.72, 13,630.41 and 5,189.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,090.72 : 13,630.41 = 5,189.76 : x
2. Step 2: Convert to fraction form
   9,090.72/13,630.41 = 5,189.76/x
3. Step 3: Cross multiply
   9,090.72x = 13,630.41 × 5,189.76
4. Step 4: Simplify right side
   9,090.72x = 70,738,556.60
5. Step 5: Solve for x
   x = 70,738,556.60/9,090.72
6. Step 6: Final answer
   x = 7,781.40