Finding the Fourth Proportional to 5,479.55, 7,612.47 and 5,428.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,479.55 : 7,612.47 = 5,428.31 : x
2. Step 2: Convert to fraction form
   5,479.55/7,612.47 = 5,428.31/x
3. Step 3: Cross multiply
   5,479.55x = 7,612.47 × 5,428.31
4. Step 4: Simplify right side
   5,479.55x = 41,322,819.88
5. Step 5: Solve for x
   x = 41,322,819.88/5,479.55
6. Step 6: Final answer
   x = 7,541.29