Finding the Fourth Proportional to 1,429.60, 1,973.16 and 840.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.60 : 1,973.16 = 840.48 : x
2. Step 2: Convert to fraction form
   1,429.60/1,973.16 = 840.48/x
3. Step 3: Cross multiply
   1,429.60x = 1,973.16 × 840.48
4. Step 4: Simplify right side
   1,429.60x = 1,658,394.12
5. Step 5: Solve for x
   x = 1,658,394.12/1,429.60
6. Step 6: Final answer
   x = 1,160.04