Finding the Fourth Proportional to 2,105.03, 3,158.45 and 1,129.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.03 : 3,158.45 = 1,129.99 : x
2. Step 2: Convert to fraction form
   2,105.03/3,158.45 = 1,129.99/x
3. Step 3: Cross multiply
   2,105.03x = 3,158.45 × 1,129.99
4. Step 4: Simplify right side
   2,105.03x = 3,569,001.12
5. Step 5: Solve for x
   x = 3,569,001.12/2,105.03
6. Step 6: Final answer
   x = 1,695.47