Finding the Fourth Proportional to 1,385.02, 1,912.04 and 853.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.02 : 1,912.04 = 853.93 : x
2. Step 2: Convert to fraction form
   1,385.02/1,912.04 = 853.93/x
3. Step 3: Cross multiply
   1,385.02x = 1,912.04 × 853.93
4. Step 4: Simplify right side
   1,385.02x = 1,632,748.32
5. Step 5: Solve for x
   x = 1,632,748.32/1,385.02
6. Step 6: Final answer
   x = 1,178.86