Finding the Fourth Proportional to 1,429.51, 1,971.15 and 931.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.51 : 1,971.15 = 931.22 : x
2. Step 2: Convert to fraction form
   1,429.51/1,971.15 = 931.22/x
3. Step 3: Cross multiply
   1,429.51x = 1,971.15 × 931.22
4. Step 4: Simplify right side
   1,429.51x = 1,835,574.30
5. Step 5: Solve for x
   x = 1,835,574.30/1,429.51
6. Step 6: Final answer
   x = 1,284.06