Finding the Fourth Proportional to 2,602.50, 3,905.07 and 1,139.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.50 : 3,905.07 = 1,139.91 : x
2. Step 2: Convert to fraction form
   2,602.50/3,905.07 = 1,139.91/x
3. Step 3: Cross multiply
   2,602.50x = 3,905.07 × 1,139.91
4. Step 4: Simplify right side
   2,602.50x = 4,451,428.34
5. Step 5: Solve for x
   x = 4,451,428.34/2,602.50
6. Step 6: Final answer
   x = 1,710.44