Finding the Fourth Proportional to 7,404.06, 10,218.78 and 5,420.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,404.06 : 10,218.78 = 5,420.10 : x
2. Step 2: Convert to fraction form
   7,404.06/10,218.78 = 5,420.10/x
3. Step 3: Cross multiply
   7,404.06x = 10,218.78 × 5,420.10
4. Step 4: Simplify right side
   7,404.06x = 55,386,809.48
5. Step 5: Solve for x
   x = 55,386,809.48/7,404.06
6. Step 6: Final answer
   x = 7,480.60