Finding the Fourth Proportional to 1,139.85, 1,709.51 and 1,114.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.85 : 1,709.51 = 1,114.61 : x
2. Step 2: Convert to fraction form
   1,139.85/1,709.51 = 1,114.61/x
3. Step 3: Cross multiply
   1,139.85x = 1,709.51 × 1,114.61
4. Step 4: Simplify right side
   1,139.85x = 1,905,422.82
5. Step 5: Solve for x
   x = 1,905,422.82/1,139.85
6. Step 6: Final answer
   x = 1,671.64