Finding the Fourth Proportional to 1,385.06, 1,910.91 and 887.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.06 : 1,910.91 = 887.98 : x
2. Step 2: Convert to fraction form
   1,385.06/1,910.91 = 887.98/x
3. Step 3: Cross multiply
   1,385.06x = 1,910.91 × 887.98
4. Step 4: Simplify right side
   1,385.06x = 1,696,849.86
5. Step 5: Solve for x
   x = 1,696,849.86/1,385.06
6. Step 6: Final answer
   x = 1,225.11