Finding the Fourth Proportional to 1,381.99, 1,900.61 and 1,098.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.99 : 1,900.61 = 1,098.89 : x
2. Step 2: Convert to fraction form
   1,381.99/1,900.61 = 1,098.89/x
3. Step 3: Cross multiply
   1,381.99x = 1,900.61 × 1,098.89
4. Step 4: Simplify right side
   1,381.99x = 2,088,560.58
5. Step 5: Solve for x
   x = 2,088,560.58/1,381.99
6. Step 6: Final answer
   x = 1,511.27