Finding the Fourth Proportional to 1,677.48, 2,315.52 and 1,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.48 : 2,315.52 = 1,139.16 : x
2. Step 2: Convert to fraction form
   1,677.48/2,315.52 = 1,139.16/x
3. Step 3: Cross multiply
   1,677.48x = 2,315.52 × 1,139.16
4. Step 4: Simplify right side
   1,677.48x = 2,637,747.76
5. Step 5: Solve for x
   x = 2,637,747.76/1,677.48
6. Step 6: Final answer
   x = 1,572.45