Finding the Fourth Proportional to 9,961.59, 14,940.35 and 3,720.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,961.59 : 14,940.35 = 3,720.45 : x
2. Step 2: Convert to fraction form
   9,961.59/14,940.35 = 3,720.45/x
3. Step 3: Cross multiply
   9,961.59x = 14,940.35 × 3,720.45
4. Step 4: Simplify right side
   9,961.59x = 55,584,806.56
5. Step 5: Solve for x
   x = 55,584,806.56/9,961.59
6. Step 6: Final answer
   x = 5,579.91