Finding the Fourth Proportional to 10,520.66, 15,779.12 and 3,499.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,520.66 : 15,779.12 = 3,499.98 : x
2. Step 2: Convert to fraction form
   10,520.66/15,779.12 = 3,499.98/x
3. Step 3: Cross multiply
   10,520.66x = 15,779.12 × 3,499.98
4. Step 4: Simplify right side
   10,520.66x = 55,226,604.42
5. Step 5: Solve for x
   x = 55,226,604.42/10,520.66
6. Step 6: Final answer
   x = 5,249.35