Finding the Fourth Proportional to 3,967.28, 5,980.72 and 3,699.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,967.28 : 5,980.72 = 3,699.75 : x
2. Step 2: Convert to fraction form
   3,967.28/5,980.72 = 3,699.75/x
3. Step 3: Cross multiply
   3,967.28x = 5,980.72 × 3,699.75
4. Step 4: Simplify right side
   3,967.28x = 22,127,151.02
5. Step 5: Solve for x
   x = 22,127,151.02/3,967.28
6. Step 6: Final answer
   x = 5,577.42