Finding the Fourth Proportional to 1,885.67, 2,602.76 and 1,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,885.67 : 2,602.76 = 1,139.50 : x
2. Step 2: Convert to fraction form
   1,885.67/2,602.76 = 1,139.50/x
3. Step 3: Cross multiply
   1,885.67x = 2,602.76 × 1,139.50
4. Step 4: Simplify right side
   1,885.67x = 2,965,845.02
5. Step 5: Solve for x
   x = 2,965,845.02/1,885.67
6. Step 6: Final answer
   x = 1,572.83