Finding the Fourth Proportional to 10,520.75, 15,783.70 and 3,500.75

Step by Step Solution

1. Step 1: Write the proportion equation
   10,520.75 : 15,783.70 = 3,500.75 : x
2. Step 2: Convert to fraction form
   10,520.75/15,783.70 = 3,500.75/x
3. Step 3: Cross multiply
   10,520.75x = 15,783.70 × 3,500.75
4. Step 4: Simplify right side
   10,520.75x = 55,254,834.89
5. Step 5: Solve for x
   x = 55,254,834.89/10,520.75
6. Step 6: Final answer
   x = 5,251.99