Finding the Fourth Proportional to 1,364.42, 1,881.55 and 840.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,364.42 : 1,881.55 = 840.35 : x
2. Step 2: Convert to fraction form
   1,364.42/1,881.55 = 840.35/x
3. Step 3: Cross multiply
   1,364.42x = 1,881.55 × 840.35
4. Step 4: Simplify right side
   1,364.42x = 1,581,160.54
5. Step 5: Solve for x
   x = 1,581,160.54/1,364.42
6. Step 6: Final answer
   x = 1,158.85