Finding the Fourth Proportional to 7,157.78, 9,886.94 and 5,499.59

Step by Step Solution

1. Step 1: Write the proportion equation
   7,157.78 : 9,886.94 = 5,499.59 : x
2. Step 2: Convert to fraction form
   7,157.78/9,886.94 = 5,499.59/x
3. Step 3: Cross multiply
   7,157.78x = 9,886.94 × 5,499.59
4. Step 4: Simplify right side
   7,157.78x = 54,374,039.42
5. Step 5: Solve for x
   x = 54,374,039.42/7,157.78
6. Step 6: Final answer
   x = 7,596.50