Finding the Fourth Proportional to 1,429.72, 1,973.36 and 840.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.72 : 1,973.36 = 840.44 : x
2. Step 2: Convert to fraction form
   1,429.72/1,973.36 = 840.44/x
3. Step 3: Cross multiply
   1,429.72x = 1,973.36 × 840.44
4. Step 4: Simplify right side
   1,429.72x = 1,658,497.71
5. Step 5: Solve for x
   x = 1,658,497.71/1,429.72
6. Step 6: Final answer
   x = 1,160.02