Finding the Fourth Proportional to 1,437.89, 1,984.56 and 840.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,437.89 : 1,984.56 = 840.45 : x
2. Step 2: Convert to fraction form
   1,437.89/1,984.56 = 840.45/x
3. Step 3: Cross multiply
   1,437.89x = 1,984.56 × 840.45
4. Step 4: Simplify right side
   1,437.89x = 1,667,923.45
5. Step 5: Solve for x
   x = 1,667,923.45/1,437.89
6. Step 6: Final answer
   x = 1,159.98