Finding the Fourth Proportional to 1,429.59, 1,980.28 and 1,400.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.59 : 1,980.28 = 1,400.43 : x
2. Step 2: Convert to fraction form
   1,429.59/1,980.28 = 1,400.43/x
3. Step 3: Cross multiply
   1,429.59x = 1,980.28 × 1,400.43
4. Step 4: Simplify right side
   1,429.59x = 2,773,240.02
5. Step 5: Solve for x
   x = 2,773,240.02/1,429.59
6. Step 6: Final answer
   x = 1,939.88