Finding the Fourth Proportional to 1,936.61, 2,672.53 and 1,139.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,936.61 : 2,672.53 = 1,139.96 : x
2. Step 2: Convert to fraction form
   1,936.61/2,672.53 = 1,139.96/x
3. Step 3: Cross multiply
   1,936.61x = 2,672.53 × 1,139.96
4. Step 4: Simplify right side
   1,936.61x = 3,046,577.30
5. Step 5: Solve for x
   x = 3,046,577.30/1,936.61
6. Step 6: Final answer
   x = 1,573.15