Finding the Fourth Proportional to 1,320.58, 1,821.72 and 1,072.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.58 : 1,821.72 = 1,072.18 : x
2. Step 2: Convert to fraction form
   1,320.58/1,821.72 = 1,072.18/x
3. Step 3: Cross multiply
   1,320.58x = 1,821.72 × 1,072.18
4. Step 4: Simplify right side
   1,320.58x = 1,953,211.75
5. Step 5: Solve for x
   x = 1,953,211.75/1,320.58
6. Step 6: Final answer
   x = 1,479.06