Finding the Fourth Proportional to 28,101.41, 42,172.89 and 13,310.35

Step by Step Solution

1. Step 1: Write the proportion equation
   28,101.41 : 42,172.89 = 13,310.35 : x
2. Step 2: Convert to fraction form
   28,101.41/42,172.89 = 13,310.35/x
3. Step 3: Cross multiply
   28,101.41x = 42,172.89 × 13,310.35
4. Step 4: Simplify right side
   28,101.41x = 561,335,859.86
5. Step 5: Solve for x
   x = 561,335,859.86/28,101.41
6. Step 6: Final answer
   x = 19,975.36