Finding the Fourth Proportional to 1,385.90, 2,081.73 and 1,099.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.90 : 2,081.73 = 1,099.34 : x
2. Step 2: Convert to fraction form
   1,385.90/2,081.73 = 1,099.34/x
3. Step 3: Cross multiply
   1,385.90x = 2,081.73 × 1,099.34
4. Step 4: Simplify right side
   1,385.90x = 2,288,529.06
5. Step 5: Solve for x
   x = 2,288,529.06/1,385.90
6. Step 6: Final answer
   x = 1,651.29