Finding the Fourth Proportional to 1,371.25, 1,892.29 and 840.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.25 : 1,892.29 = 840.34 : x
2. Step 2: Convert to fraction form
   1,371.25/1,892.29 = 840.34/x
3. Step 3: Cross multiply
   1,371.25x = 1,892.29 × 840.34
4. Step 4: Simplify right side
   1,371.25x = 1,590,166.98
5. Step 5: Solve for x
   x = 1,590,166.98/1,371.25
6. Step 6: Final answer
   x = 1,159.65