Finding the Fourth Proportional to 15,499.94, 21,389.94 and 8,426.34

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.94 : 21,389.94 = 8,426.34 : x
2. Step 2: Convert to fraction form
   15,499.94/21,389.94 = 8,426.34/x
3. Step 3: Cross multiply
   15,499.94x = 21,389.94 × 8,426.34
4. Step 4: Simplify right side
   15,499.94x = 180,238,907.02
5. Step 5: Solve for x
   x = 180,238,907.02/15,499.94
6. Step 6: Final answer
   x = 11,628.37