Finding the Fourth Proportional to 2,131.70, 2,923.89 and 2,045.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,131.70 : 2,923.89 = 2,045.30 : x
2. Step 2: Convert to fraction form
   2,131.70/2,923.89 = 2,045.30/x
3. Step 3: Cross multiply
   2,131.70x = 2,923.89 × 2,045.30
4. Step 4: Simplify right side
   2,131.70x = 5,980,221.99
5. Step 5: Solve for x
   x = 5,980,221.99/2,131.70
6. Step 6: Final answer
   x = 2,805.38