Finding the Fourth Proportional to 810.72, 1,117.71 and 670.32

Step by Step Solution

1. Step 1: Write the proportion equation
   810.72 : 1,117.71 = 670.32 : x
2. Step 2: Convert to fraction form
   810.72/1,117.71 = 670.32/x
3. Step 3: Cross multiply
   810.72x = 1,117.71 × 670.32
4. Step 4: Simplify right side
   810.72x = 749,223.37
5. Step 5: Solve for x
   x = 749,223.37/810.72
6. Step 6: Final answer
   x = 924.15