Finding the Fourth Proportional to 28,101.34, 42,172.82 and 13,310.31

Step by Step Solution

1. Step 1: Write the proportion equation
   28,101.34 : 42,172.82 = 13,310.31 : x
2. Step 2: Convert to fraction form
   28,101.34/42,172.82 = 13,310.31/x
3. Step 3: Cross multiply
   28,101.34x = 42,172.82 × 13,310.31
4. Step 4: Simplify right side
   28,101.34x = 561,333,307.77
5. Step 5: Solve for x
   x = 561,333,307.77/28,101.34
6. Step 6: Final answer
   x = 19,975.32