Finding the Fourth Proportional to 2,602.18, 3,899.82 and 1,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.18 : 3,899.82 = 1,139.50 : x
2. Step 2: Convert to fraction form
   2,602.18/3,899.82 = 1,139.50/x
3. Step 3: Cross multiply
   2,602.18x = 3,899.82 × 1,139.50
4. Step 4: Simplify right side
   2,602.18x = 4,443,844.89
5. Step 5: Solve for x
   x = 4,443,844.89/2,602.18
6. Step 6: Final answer
   x = 1,707.74