Finding the Fourth Proportional to 1,072.80, 1,606.32 and 558.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.80 : 1,606.32 = 558.72 : x
2. Step 2: Convert to fraction form
   1,072.80/1,606.32 = 558.72/x
3. Step 3: Cross multiply
   1,072.80x = 1,606.32 × 558.72
4. Step 4: Simplify right side
   1,072.80x = 897,483.11
5. Step 5: Solve for x
   x = 897,483.11/1,072.80
6. Step 6: Final answer
   x = 836.58