Finding the Fourth Proportional to 1,429.92, 1,973.16 and 840.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.92 : 1,973.16 = 840.60 : x
2. Step 2: Convert to fraction form
   1,429.92/1,973.16 = 840.60/x
3. Step 3: Cross multiply
   1,429.92x = 1,973.16 × 840.60
4. Step 4: Simplify right side
   1,429.92x = 1,658,638.30
5. Step 5: Solve for x
   x = 1,658,638.30/1,429.92
6. Step 6: Final answer
   x = 1,159.95