Finding the Fourth Proportional to 1,401.32, 2,091.80 and 1,285.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,401.32 : 2,091.80 = 1,285.76 : x
2. Step 2: Convert to fraction form
   1,401.32/2,091.80 = 1,285.76/x
3. Step 3: Cross multiply
   1,401.32x = 2,091.80 × 1,285.76
4. Step 4: Simplify right side
   1,401.32x = 2,689,552.77
5. Step 5: Solve for x
   x = 2,689,552.77/1,401.32
6. Step 6: Final answer
   x = 1,919.30