Finding the Fourth Proportional to 1,385.12, 1,910.59 and 888.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.12 : 1,910.59 = 888.08 : x
2. Step 2: Convert to fraction form
   1,385.12/1,910.59 = 888.08/x
3. Step 3: Cross multiply
   1,385.12x = 1,910.59 × 888.08
4. Step 4: Simplify right side
   1,385.12x = 1,696,755.74
5. Step 5: Solve for x
   x = 1,696,755.74/1,385.12
6. Step 6: Final answer
   x = 1,224.99