Finding the Fourth Proportional to 3,585.89, 5,378.69 and 988.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,585.89 : 5,378.69 = 988.76 : x
2. Step 2: Convert to fraction form
   3,585.89/5,378.69 = 988.76/x
3. Step 3: Cross multiply
   3,585.89x = 5,378.69 × 988.76
4. Step 4: Simplify right side
   3,585.89x = 5,318,209.10
5. Step 5: Solve for x
   x = 5,318,209.10/3,585.89
6. Step 6: Final answer
   x = 1,483.10