Finding the Fourth Proportional to 1,139.86, 1,710.62 and 1,071.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.86 : 1,710.62 = 1,071.82 : x
2. Step 2: Convert to fraction form
   1,139.86/1,710.62 = 1,071.82/x
3. Step 3: Cross multiply
   1,139.86x = 1,710.62 × 1,071.82
4. Step 4: Simplify right side
   1,139.86x = 1,833,462.82
5. Step 5: Solve for x
   x = 1,833,462.82/1,139.86
6. Step 6: Final answer
   x = 1,608.51