Finding the Fourth Proportional to 5,492.02, 8,198.30 and 5,123.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,492.02 : 8,198.30 = 5,123.20 : x
2. Step 2: Convert to fraction form
   5,492.02/8,198.30 = 5,123.20/x
3. Step 3: Cross multiply
   5,492.02x = 8,198.30 × 5,123.20
4. Step 4: Simplify right side
   5,492.02x = 42,001,530.56
5. Step 5: Solve for x
   x = 42,001,530.56/5,492.02
6. Step 6: Final answer
   x = 7,647.74