Finding the Fourth Proportional to 1,429.79, 1,973.06 and 840.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.79 : 1,973.06 = 840.71 : x
2. Step 2: Convert to fraction form
   1,429.79/1,973.06 = 840.71/x
3. Step 3: Cross multiply
   1,429.79x = 1,973.06 × 840.71
4. Step 4: Simplify right side
   1,429.79x = 1,658,775.15
5. Step 5: Solve for x
   x = 1,658,775.15/1,429.79
6. Step 6: Final answer
   x = 1,160.16