Finding the Fourth Proportional to 15,499.15, 21,388.86 and 8,425.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.15 : 21,388.86 = 8,425.42 : x
2. Step 2: Convert to fraction form
   15,499.15/21,388.86 = 8,425.42/x
3. Step 3: Cross multiply
   15,499.15x = 21,388.86 × 8,425.42
4. Step 4: Simplify right side
   15,499.15x = 180,210,075.35
5. Step 5: Solve for x
   x = 180,210,075.35/15,499.15
6. Step 6: Final answer
   x = 11,627.10