Finding the Fourth Proportional to 1,385.11, 1,910.87 and 887.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.11 : 1,910.87 = 887.59 : x
2. Step 2: Convert to fraction form
   1,385.11/1,910.87 = 887.59/x
3. Step 3: Cross multiply
   1,385.11x = 1,910.87 × 887.59
4. Step 4: Simplify right side
   1,385.11x = 1,696,064.67
5. Step 5: Solve for x
   x = 1,696,064.67/1,385.11
6. Step 6: Final answer
   x = 1,224.50