Finding the Fourth Proportional to 1,429.11, 1,971.56 and 1,009.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.11 : 1,971.56 = 1,009.40 : x
2. Step 2: Convert to fraction form
   1,429.11/1,971.56 = 1,009.40/x
3. Step 3: Cross multiply
   1,429.11x = 1,971.56 × 1,009.40
4. Step 4: Simplify right side
   1,429.11x = 1,990,077.76
5. Step 5: Solve for x
   x = 1,990,077.76/1,429.11
6. Step 6: Final answer
   x = 1,392.53