Finding the Fourth Proportional to 1,530.73, 2,112.89 and 1,216.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.73 : 2,112.89 = 1,216.55 : x
2. Step 2: Convert to fraction form
   1,530.73/2,112.89 = 1,216.55/x
3. Step 3: Cross multiply
   1,530.73x = 2,112.89 × 1,216.55
4. Step 4: Simplify right side
   1,530.73x = 2,570,435.53
5. Step 5: Solve for x
   x = 2,570,435.53/1,530.73
6. Step 6: Final answer
   x = 1,679.22