Finding the Fourth Proportional to 1,385.15, 1,911.33 and 1,176.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.15 : 1,911.33 = 1,176.17 : x
2. Step 2: Convert to fraction form
   1,385.15/1,911.33 = 1,176.17/x
3. Step 3: Cross multiply
   1,385.15x = 1,911.33 × 1,176.17
4. Step 4: Simplify right side
   1,385.15x = 2,248,039.45
5. Step 5: Solve for x
   x = 2,248,039.45/1,385.15
6. Step 6: Final answer
   x = 1,622.96