Finding the Fourth Proportional to 1,615.52, 2,223.78 and 1,391.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,615.52 : 2,223.78 = 1,391.96 : x
2. Step 2: Convert to fraction form
   1,615.52/2,223.78 = 1,391.96/x
3. Step 3: Cross multiply
   1,615.52x = 2,223.78 × 1,391.96
4. Step 4: Simplify right side
   1,615.52x = 3,095,412.81
5. Step 5: Solve for x
   x = 3,095,412.81/1,615.52
6. Step 6: Final answer
   x = 1,916.05