Finding the Fourth Proportional to 21,887.58, 30,178.52 and 15,178.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,887.58 : 30,178.52 = 15,178.98 : x
2. Step 2: Convert to fraction form
   21,887.58/30,178.52 = 15,178.98/x
3. Step 3: Cross multiply
   21,887.58x = 30,178.52 × 15,178.98
4. Step 4: Simplify right side
   21,887.58x = 458,079,151.51
5. Step 5: Solve for x
   x = 458,079,151.51/21,887.58
6. Step 6: Final answer
   x = 20,928.73