Finding the Fourth Proportional to 1,385.85, 1,911.69 and 887.97

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.85 : 1,911.69 = 887.97 : x
2. Step 2: Convert to fraction form
   1,385.85/1,911.69 = 887.97/x
3. Step 3: Cross multiply
   1,385.85x = 1,911.69 × 887.97
4. Step 4: Simplify right side
   1,385.85x = 1,697,523.37
5. Step 5: Solve for x
   x = 1,697,523.37/1,385.85
6. Step 6: Final answer
   x = 1,224.90