Finding the Fourth Proportional to 1,283.32, 1,770.42 and 840.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,283.32 : 1,770.42 = 840.52 : x
2. Step 2: Convert to fraction form
   1,283.32/1,770.42 = 840.52/x
3. Step 3: Cross multiply
   1,283.32x = 1,770.42 × 840.52
4. Step 4: Simplify right side
   1,283.32x = 1,488,073.42
5. Step 5: Solve for x
   x = 1,488,073.42/1,283.32
6. Step 6: Final answer
   x = 1,159.55