Finding the Fourth Proportional to 28,100.97, 42,172.25 and 13,309.93

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.97 : 42,172.25 = 13,309.93 : x
2. Step 2: Convert to fraction form
   28,100.97/42,172.25 = 13,309.93/x
3. Step 3: Cross multiply
   28,100.97x = 42,172.25 × 13,309.93
4. Step 4: Simplify right side
   28,100.97x = 561,309,695.44
5. Step 5: Solve for x
   x = 561,309,695.44/28,100.97
6. Step 6: Final answer
   x = 19,974.74