Finding the Fourth Proportional to 15,499.95, 21,389.83 and 8,426.22

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.95 : 21,389.83 = 8,426.22 : x
2. Step 2: Convert to fraction form
   15,499.95/21,389.83 = 8,426.22/x
3. Step 3: Cross multiply
   15,499.95x = 21,389.83 × 8,426.22
4. Step 4: Simplify right side
   15,499.95x = 180,235,413.34
5. Step 5: Solve for x
   x = 180,235,413.34/15,499.95
6. Step 6: Final answer
   x = 11,628.13