Finding the Fourth Proportional to 789.56, 1,089.04 and 670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   789.56 : 1,089.04 = 670.72 : x
2. Step 2: Convert to fraction form
   789.56/1,089.04 = 670.72/x
3. Step 3: Cross multiply
   789.56x = 1,089.04 × 670.72
4. Step 4: Simplify right side
   789.56x = 730,440.91
5. Step 5: Solve for x
   x = 730,440.91/789.56
6. Step 6: Final answer
   x = 925.12