Finding the Fourth Proportional to 10,535.42, 15,810.63 and 4,989.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,535.42 : 15,810.63 = 4,989.99 : x
2. Step 2: Convert to fraction form
   10,535.42/15,810.63 = 4,989.99/x
3. Step 3: Cross multiply
   10,535.42x = 15,810.63 × 4,989.99
4. Step 4: Simplify right side
   10,535.42x = 78,894,806.54
5. Step 5: Solve for x
   x = 78,894,806.54/10,535.42
6. Step 6: Final answer
   x = 7,488.53