Finding the Fourth Proportional to 1,384.89, 1,911.01 and 853.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.89 : 1,911.01 = 853.62 : x
2. Step 2: Convert to fraction form
   1,384.89/1,911.01 = 853.62/x
3. Step 3: Cross multiply
   1,384.89x = 1,911.01 × 853.62
4. Step 4: Simplify right side
   1,384.89x = 1,631,276.36
5. Step 5: Solve for x
   x = 1,631,276.36/1,384.89
6. Step 6: Final answer
   x = 1,177.91