Finding the Fourth Proportional to 1,429.90, 2,142.91 and 874.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.90 : 2,142.91 = 874.81 : x
2. Step 2: Convert to fraction form
   1,429.90/2,142.91 = 874.81/x
3. Step 3: Cross multiply
   1,429.90x = 2,142.91 × 874.81
4. Step 4: Simplify right side
   1,429.90x = 1,874,631.55
5. Step 5: Solve for x
   x = 1,874,631.55/1,429.90
6. Step 6: Final answer
   x = 1,311.03