Finding the Fourth Proportional to 1,611.37, 2,223.51 and 1,013.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.37 : 2,223.51 = 1,013.72 : x
2. Step 2: Convert to fraction form
   1,611.37/2,223.51 = 1,013.72/x
3. Step 3: Cross multiply
   1,611.37x = 2,223.51 × 1,013.72
4. Step 4: Simplify right side
   1,611.37x = 2,254,016.56
5. Step 5: Solve for x
   x = 2,254,016.56/1,611.37
6. Step 6: Final answer
   x = 1,398.82