Finding the Fourth Proportional to 28,089.50, 42,146.55 and 13,308.98

Step by Step Solution

1. Step 1: Write the proportion equation
   28,089.50 : 42,146.55 = 13,308.98 : x
2. Step 2: Convert to fraction form
   28,089.50/42,146.55 = 13,308.98/x
3. Step 3: Cross multiply
   28,089.50x = 42,146.55 × 13,308.98
4. Step 4: Simplify right side
   28,089.50x = 560,927,591.02
5. Step 5: Solve for x
   x = 560,927,591.02/28,089.50
6. Step 6: Final answer
   x = 19,969.30