Finding the Fourth Proportional to 1,066.73, 1,472.06 and 641.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.73 : 1,472.06 = 641.61 : x
2. Step 2: Convert to fraction form
   1,066.73/1,472.06 = 641.61/x
3. Step 3: Cross multiply
   1,066.73x = 1,472.06 × 641.61
4. Step 4: Simplify right side
   1,066.73x = 944,490.02
5. Step 5: Solve for x
   x = 944,490.02/1,066.73
6. Step 6: Final answer
   x = 885.41