Finding the Fourth Proportional to 28,108.94, 42,185.54 and 13,108.34

Step by Step Solution

1. Step 1: Write the proportion equation
   28,108.94 : 42,185.54 = 13,108.34 : x
2. Step 2: Convert to fraction form
   28,108.94/42,185.54 = 13,108.34/x
3. Step 3: Cross multiply
   28,108.94x = 42,185.54 × 13,108.34
4. Step 4: Simplify right side
   28,108.94x = 552,982,406.58
5. Step 5: Solve for x
   x = 552,982,406.58/28,108.94
6. Step 6: Final answer
   x = 19,672.83