Finding the Fourth Proportional to 10,905.04, 16,359.72 and 3,980.08

Step by Step Solution

1. Step 1: Write the proportion equation
   10,905.04 : 16,359.72 = 3,980.08 : x
2. Step 2: Convert to fraction form
   10,905.04/16,359.72 = 3,980.08/x
3. Step 3: Cross multiply
   10,905.04x = 16,359.72 × 3,980.08
4. Step 4: Simplify right side
   10,905.04x = 65,112,994.38
5. Step 5: Solve for x
   x = 65,112,994.38/10,905.04
6. Step 6: Final answer
   x = 5,970.91