Finding the Fourth Proportional to 2,105.17, 2,905.20 and 1,160.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.17 : 2,905.20 = 1,160.99 : x
2. Step 2: Convert to fraction form
   2,105.17/2,905.20 = 1,160.99/x
3. Step 3: Cross multiply
   2,105.17x = 2,905.20 × 1,160.99
4. Step 4: Simplify right side
   2,105.17x = 3,372,908.15
5. Step 5: Solve for x
   x = 3,372,908.15/2,105.17
6. Step 6: Final answer
   x = 1,602.20