Finding the Fourth Proportional to 10,518.18, 15,777.20 and 3,498.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,518.18 : 15,777.20 = 3,498.72 : x
2. Step 2: Convert to fraction form
   10,518.18/15,777.20 = 3,498.72/x
3. Step 3: Cross multiply
   10,518.18x = 15,777.20 × 3,498.72
4. Step 4: Simplify right side
   10,518.18x = 55,199,987.69
5. Step 5: Solve for x
   x = 55,199,987.69/10,518.18
6. Step 6: Final answer
   x = 5,248.06