Finding the Fourth Proportional to 1,438.05, 2,141.12 and 1,429.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.05 : 2,141.12 = 1,429.95 : x
2. Step 2: Convert to fraction form
   1,438.05/2,141.12 = 1,429.95/x
3. Step 3: Cross multiply
   1,438.05x = 2,141.12 × 1,429.95
4. Step 4: Simplify right side
   1,438.05x = 3,061,687.39
5. Step 5: Solve for x
   x = 3,061,687.39/1,438.05
6. Step 6: Final answer
   x = 2,129.05