Finding the Fourth Proportional to 1,112.72, 1,535.76 and 647.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.72 : 1,535.76 = 647.04 : x
2. Step 2: Convert to fraction form
   1,112.72/1,535.76 = 647.04/x
3. Step 3: Cross multiply
   1,112.72x = 1,535.76 × 647.04
4. Step 4: Simplify right side
   1,112.72x = 993,698.15
5. Step 5: Solve for x
   x = 993,698.15/1,112.72
6. Step 6: Final answer
   x = 893.04