Finding the Fourth Proportional to 1,139.53, 1,700.35 and 1,069.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.53 : 1,700.35 = 1,069.87 : x
2. Step 2: Convert to fraction form
   1,139.53/1,700.35 = 1,069.87/x
3. Step 3: Cross multiply
   1,139.53x = 1,700.35 × 1,069.87
4. Step 4: Simplify right side
   1,139.53x = 1,819,146.53
5. Step 5: Solve for x
   x = 1,819,146.53/1,139.53
6. Step 6: Final answer
   x = 1,596.40