Finding the Fourth Proportional to 1,439.85, 1,988.83 and 1,101.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.85 : 1,988.83 = 1,101.69 : x
2. Step 2: Convert to fraction form
   1,439.85/1,988.83 = 1,101.69/x
3. Step 3: Cross multiply
   1,439.85x = 1,988.83 × 1,101.69
4. Step 4: Simplify right side
   1,439.85x = 2,191,080.89
5. Step 5: Solve for x
   x = 2,191,080.89/1,439.85
6. Step 6: Final answer
   x = 1,521.74