Finding the Fourth Proportional to 28,117.16, 42,196.50 and 13,326.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,117.16 : 42,196.50 = 13,326.12 : x
2. Step 2: Convert to fraction form
   28,117.16/42,196.50 = 13,326.12/x
3. Step 3: Cross multiply
   28,117.16x = 42,196.50 × 13,326.12
4. Step 4: Simplify right side
   28,117.16x = 562,315,622.58
5. Step 5: Solve for x
   x = 562,315,622.58/28,117.16
6. Step 6: Final answer
   x = 19,999.02