Finding the Fourth Proportional to 1,429.89, 1,973.58 and 840.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.89 : 1,973.58 = 840.62 : x
2. Step 2: Convert to fraction form
   1,429.89/1,973.58 = 840.62/x
3. Step 3: Cross multiply
   1,429.89x = 1,973.58 × 840.62
4. Step 4: Simplify right side
   1,429.89x = 1,659,020.95
5. Step 5: Solve for x
   x = 1,659,020.95/1,429.89
6. Step 6: Final answer
   x = 1,160.24