Finding the Fourth Proportional to 2,088.18, 2,885.49 and 1,390.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,088.18 : 2,885.49 = 1,390.50 : x
2. Step 2: Convert to fraction form
   2,088.18/2,885.49 = 1,390.50/x
3. Step 3: Cross multiply
   2,088.18x = 2,885.49 × 1,390.50
4. Step 4: Simplify right side
   2,088.18x = 4,012,273.85
5. Step 5: Solve for x
   x = 4,012,273.85/2,088.18
6. Step 6: Final answer
   x = 1,921.42