Finding the Fourth Proportional to 7,418.79, 11,128.59 and 3,720.53

Step by Step Solution

1. Step 1: Write the proportion equation
   7,418.79 : 11,128.59 = 3,720.53 : x
2. Step 2: Convert to fraction form
   7,418.79/11,128.59 = 3,720.53/x
3. Step 3: Cross multiply
   7,418.79x = 11,128.59 × 3,720.53
4. Step 4: Simplify right side
   7,418.79x = 41,404,280.77
5. Step 5: Solve for x
   x = 41,404,280.77/7,418.79
6. Step 6: Final answer
   x = 5,581.00