Finding the Fourth Proportional to 28,216.72, 42,303.48 and 13,976.56

Step by Step Solution

1. Step 1: Write the proportion equation
   28,216.72 : 42,303.48 = 13,976.56 : x
2. Step 2: Convert to fraction form
   28,216.72/42,303.48 = 13,976.56/x
3. Step 3: Cross multiply
   28,216.72x = 42,303.48 × 13,976.56
4. Step 4: Simplify right side
   28,216.72x = 591,257,126.43
5. Step 5: Solve for x
   x = 591,257,126.43/28,216.72
6. Step 6: Final answer
   x = 20,954.14