Finding the Fourth Proportional to 7,166.78, 9,886.56 and 5,400.80

Step by Step Solution

1. Step 1: Write the proportion equation
   7,166.78 : 9,886.56 = 5,400.80 : x
2. Step 2: Convert to fraction form
   7,166.78/9,886.56 = 5,400.80/x
3. Step 3: Cross multiply
   7,166.78x = 9,886.56 × 5,400.80
4. Step 4: Simplify right side
   7,166.78x = 53,395,333.25
5. Step 5: Solve for x
   x = 53,395,333.25/7,166.78
6. Step 6: Final answer
   x = 7,450.39