Finding the Fourth Proportional to 28,188.50, 42,279.38 and 7,413.62

Step by Step Solution

1. Step 1: Write the proportion equation
   28,188.50 : 42,279.38 = 7,413.62 : x
2. Step 2: Convert to fraction form
   28,188.50/42,279.38 = 7,413.62/x
3. Step 3: Cross multiply
   28,188.50x = 42,279.38 × 7,413.62
4. Step 4: Simplify right side
   28,188.50x = 313,443,064.29
5. Step 5: Solve for x
   x = 313,443,064.29/28,188.50
6. Step 6: Final answer
   x = 11,119.54