Finding the Fourth Proportional to 7,478.98, 10,246.24 and 7,198.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,478.98 : 10,246.24 = 7,198.72 : x
2. Step 2: Convert to fraction form
   7,478.98/10,246.24 = 7,198.72/x
3. Step 3: Cross multiply
   7,478.98x = 10,246.24 × 7,198.72
4. Step 4: Simplify right side
   7,478.98x = 73,759,812.81
5. Step 5: Solve for x
   x = 73,759,812.81/7,478.98
6. Step 6: Final answer
   x = 9,862.28