Finding the Fourth Proportional to 1,215.38, 1,826.72 and 1,069.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.38 : 1,826.72 = 1,069.58 : x
2. Step 2: Convert to fraction form
   1,215.38/1,826.72 = 1,069.58/x
3. Step 3: Cross multiply
   1,215.38x = 1,826.72 × 1,069.58
4. Step 4: Simplify right side
   1,215.38x = 1,953,823.18
5. Step 5: Solve for x
   x = 1,953,823.18/1,215.38
6. Step 6: Final answer
   x = 1,607.58