Finding the Fourth Proportional to 2,600.84, 3,901.50 and 869.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,600.84 : 3,901.50 = 869.72 : x
2. Step 2: Convert to fraction form
   2,600.84/3,901.50 = 869.72/x
3. Step 3: Cross multiply
   2,600.84x = 3,901.50 × 869.72
4. Step 4: Simplify right side
   2,600.84x = 3,393,212.58
5. Step 5: Solve for x
   x = 3,393,212.58/2,600.84
6. Step 6: Final answer
   x = 1,304.66