Finding the Fourth Proportional to 1,552.98, 2,138.76 and 1,288.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,552.98 : 2,138.76 = 1,288.56 : x
2. Step 2: Convert to fraction form
   1,552.98/2,138.76 = 1,288.56/x
3. Step 3: Cross multiply
   1,552.98x = 2,138.76 × 1,288.56
4. Step 4: Simplify right side
   1,552.98x = 2,755,920.59
5. Step 5: Solve for x
   x = 2,755,920.59/1,552.98
6. Step 6: Final answer
   x = 1,774.60