Finding the Fourth Proportional to 28,118.91, 42,185.67 and 13,327.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,118.91 : 42,185.67 = 13,327.50 : x
2. Step 2: Convert to fraction form
   28,118.91/42,185.67 = 13,327.50/x
3. Step 3: Cross multiply
   28,118.91x = 42,185.67 × 13,327.50
4. Step 4: Simplify right side
   28,118.91x = 562,229,516.93
5. Step 5: Solve for x
   x = 562,229,516.93/28,118.91
6. Step 6: Final answer
   x = 19,994.71