Finding the Fourth Proportional to 15,499.61, 21,389.04 and 8,426.06

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.61 : 21,389.04 = 8,426.06 : x
2. Step 2: Convert to fraction form
   15,499.61/21,389.04 = 8,426.06/x
3. Step 3: Cross multiply
   15,499.61x = 21,389.04 × 8,426.06
4. Step 4: Simplify right side
   15,499.61x = 180,225,227.44
5. Step 5: Solve for x
   x = 180,225,227.44/15,499.61
6. Step 6: Final answer
   x = 11,627.73