Finding the Fourth Proportional to 1,112.68, 1,535.16 and 670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,112.68 : 1,535.16 = 670.72 : x
2. Step 2: Convert to fraction form
   1,112.68/1,535.16 = 670.72/x
3. Step 3: Cross multiply
   1,112.68x = 1,535.16 × 670.72
4. Step 4: Simplify right side
   1,112.68x = 1,029,662.52
5. Step 5: Solve for x
   x = 1,029,662.52/1,112.68
6. Step 6: Final answer
   x = 925.39