Finding the Fourth Proportional to 1,520.84, 2,277.59 and 869.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.84 : 2,277.59 = 869.60 : x
2. Step 2: Convert to fraction form
   1,520.84/2,277.59 = 869.60/x
3. Step 3: Cross multiply
   1,520.84x = 2,277.59 × 869.60
4. Step 4: Simplify right side
   1,520.84x = 1,980,593.61
5. Step 5: Solve for x
   x = 1,980,593.61/1,520.84
6. Step 6: Final answer
   x = 1,302.30