Finding the Fourth Proportional to 1,050.75, 1,448.37 and 840.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,050.75 : 1,448.37 = 840.60 : x
2. Step 2: Convert to fraction form
   1,050.75/1,448.37 = 840.60/x
3. Step 3: Cross multiply
   1,050.75x = 1,448.37 × 840.60
4. Step 4: Simplify right side
   1,050.75x = 1,217,499.82
5. Step 5: Solve for x
   x = 1,217,499.82/1,050.75
6. Step 6: Final answer
   x = 1,158.70