Finding the Fourth Proportional to 1,885.59, 2,601.05 and 1,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,885.59 : 2,601.05 = 1,139.31 : x
2. Step 2: Convert to fraction form
   1,885.59/2,601.05 = 1,139.31/x
3. Step 3: Cross multiply
   1,885.59x = 2,601.05 × 1,139.31
4. Step 4: Simplify right side
   1,885.59x = 2,963,396.58
5. Step 5: Solve for x
   x = 2,963,396.58/1,885.59
6. Step 6: Final answer
   x = 1,571.60