Finding the Fourth Proportional to 28,100.58, 42,171.60 and 13,309.47

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.58 : 42,171.60 = 13,309.47 : x
2. Step 2: Convert to fraction form
   28,100.58/42,171.60 = 13,309.47/x
3. Step 3: Cross multiply
   28,100.58x = 42,171.60 × 13,309.47
4. Step 4: Simplify right side
   28,100.58x = 561,281,645.05
5. Step 5: Solve for x
   x = 561,281,645.05/28,100.58
6. Step 6: Final answer
   x = 19,974.02