Finding the Fourth Proportional to 1,385.32, 1,910.98 and 853.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.32 : 1,910.98 = 853.96 : x
2. Step 2: Convert to fraction form
   1,385.32/1,910.98 = 853.96/x
3. Step 3: Cross multiply
   1,385.32x = 1,910.98 × 853.96
4. Step 4: Simplify right side
   1,385.32x = 1,631,900.48
5. Step 5: Solve for x
   x = 1,631,900.48/1,385.32
6. Step 6: Final answer
   x = 1,178.00