Finding the Fourth Proportional to 1,139.50, 1,700.83 and 1,111.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.50 : 1,700.83 = 1,111.87 : x
2. Step 2: Convert to fraction form
   1,139.50/1,700.83 = 1,111.87/x
3. Step 3: Cross multiply
   1,139.50x = 1,700.83 × 1,111.87
4. Step 4: Simplify right side
   1,139.50x = 1,891,096.29
5. Step 5: Solve for x
   x = 1,891,096.29/1,139.50
6. Step 6: Final answer
   x = 1,659.58