Finding the Fourth Proportional to 1,429.90, 1,971.37 and 1,031.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.90 : 1,971.37 = 1,031.22 : x
2. Step 2: Convert to fraction form
   1,429.90/1,971.37 = 1,031.22/x
3. Step 3: Cross multiply
   1,429.90x = 1,971.37 × 1,031.22
4. Step 4: Simplify right side
   1,429.90x = 2,032,916.17
5. Step 5: Solve for x
   x = 2,032,916.17/1,429.90
6. Step 6: Final answer
   x = 1,421.72