Finding the Fourth Proportional to 2,143.89, 2,957.58 and 1,670.99

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.89 : 2,957.58 = 1,670.99 : x
2. Step 2: Convert to fraction form
   2,143.89/2,957.58 = 1,670.99/x
3. Step 3: Cross multiply
   2,143.89x = 2,957.58 × 1,670.99
4. Step 4: Simplify right side
   2,143.89x = 4,942,071.82
5. Step 5: Solve for x
   x = 4,942,071.82/2,143.89
6. Step 6: Final answer
   x = 2,305.19