Finding the Fourth Proportional to 2,145.17, 2,961.72 and 1,920.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.17 : 2,961.72 = 1,920.71 : x
2. Step 2: Convert to fraction form
   2,145.17/2,961.72 = 1,920.71/x
3. Step 3: Cross multiply
   2,145.17x = 2,961.72 × 1,920.71
4. Step 4: Simplify right side
   2,145.17x = 5,688,605.22
5. Step 5: Solve for x
   x = 5,688,605.22/2,145.17
6. Step 6: Final answer
   x = 2,651.82