Finding the Fourth Proportional to 1,603.72, 2,211.78 and 1,072.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.72 : 2,211.78 = 1,072.84 : x
2. Step 2: Convert to fraction form
   1,603.72/2,211.78 = 1,072.84/x
3. Step 3: Cross multiply
   1,603.72x = 2,211.78 × 1,072.84
4. Step 4: Simplify right side
   1,603.72x = 2,372,886.06
5. Step 5: Solve for x
   x = 2,372,886.06/1,603.72
6. Step 6: Final answer
   x = 1,479.61