Finding the Fourth Proportional to 7,419.98, 10,242.72 and 7,220.07

Step by Step Solution

1. Step 1: Write the proportion equation
   7,419.98 : 10,242.72 = 7,220.07 : x
2. Step 2: Convert to fraction form
   7,419.98/10,242.72 = 7,220.07/x
3. Step 3: Cross multiply
   7,419.98x = 10,242.72 × 7,220.07
4. Step 4: Simplify right side
   7,419.98x = 73,953,155.39
5. Step 5: Solve for x
   x = 73,953,155.39/7,419.98
6. Step 6: Final answer
   x = 9,966.76