Finding the Fourth Proportional to 1,084.17, 1,495.83 and 641.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.17 : 1,495.83 = 641.76 : x
2. Step 2: Convert to fraction form
   1,084.17/1,495.83 = 641.76/x
3. Step 3: Cross multiply
   1,084.17x = 1,495.83 × 641.76
4. Step 4: Simplify right side
   1,084.17x = 959,963.86
5. Step 5: Solve for x
   x = 959,963.86/1,084.17
6. Step 6: Final answer
   x = 885.44