Finding the Fourth Proportional to 1,885.71, 2,602.35 and 1,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,885.71 : 2,602.35 = 1,139.52 : x
2. Step 2: Convert to fraction form
   1,885.71/2,602.35 = 1,139.52/x
3. Step 3: Cross multiply
   1,885.71x = 2,602.35 × 1,139.52
4. Step 4: Simplify right side
   1,885.71x = 2,965,429.87
5. Step 5: Solve for x
   x = 2,965,429.87/1,885.71
6. Step 6: Final answer
   x = 1,572.58