Finding the Fourth Proportional to 28,599.50, 42,905.73 and 10,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,599.50 : 42,905.73 = 10,131.50 : x
2. Step 2: Convert to fraction form
   28,599.50/42,905.73 = 10,131.50/x
3. Step 3: Cross multiply
   28,599.50x = 42,905.73 × 10,131.50
4. Step 4: Simplify right side
   28,599.50x = 434,699,403.50
5. Step 5: Solve for x
   x = 434,699,403.50/28,599.50
6. Step 6: Final answer
   x = 15,199.55