Finding the Fourth Proportional to 1,871.42, 2,803.47 and 1,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,871.42 : 2,803.47 = 1,139.18 : x
2. Step 2: Convert to fraction form
   1,871.42/2,803.47 = 1,139.18/x
3. Step 3: Cross multiply
   1,871.42x = 2,803.47 × 1,139.18
4. Step 4: Simplify right side
   1,871.42x = 3,193,656.95
5. Step 5: Solve for x
   x = 3,193,656.95/1,871.42
6. Step 6: Final answer
   x = 1,706.54