Finding the Fourth Proportional to 1,321.05, 1,823.94 and 1,180.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.05 : 1,823.94 = 1,180.72 : x
2. Step 2: Convert to fraction form
   1,321.05/1,823.94 = 1,180.72/x
3. Step 3: Cross multiply
   1,321.05x = 1,823.94 × 1,180.72
4. Step 4: Simplify right side
   1,321.05x = 2,153,557.88
5. Step 5: Solve for x
   x = 2,153,557.88/1,321.05
6. Step 6: Final answer
   x = 1,630.19