Finding the Fourth Proportional to 10,665.69, 15,991.69 and 4,430.01

Step by Step Solution

1. Step 1: Write the proportion equation
   10,665.69 : 15,991.69 = 4,430.01 : x
2. Step 2: Convert to fraction form
   10,665.69/15,991.69 = 4,430.01/x
3. Step 3: Cross multiply
   10,665.69x = 15,991.69 × 4,430.01
4. Step 4: Simplify right side
   10,665.69x = 70,843,346.62
5. Step 5: Solve for x
   x = 70,843,346.62/10,665.69
6. Step 6: Final answer
   x = 6,642.17