Finding the Fourth Proportional to 42,413.30, 63,627.15 and 12,830.90

Step by Step Solution

1. Step 1: Write the proportion equation
   42,413.30 : 63,627.15 = 12,830.90 : x
2. Step 2: Convert to fraction form
   42,413.30/63,627.15 = 12,830.90/x
3. Step 3: Cross multiply
   42,413.30x = 63,627.15 × 12,830.90
4. Step 4: Simplify right side
   42,413.30x = 816,393,598.94
5. Step 5: Solve for x
   x = 816,393,598.94/42,413.30
6. Step 6: Final answer
   x = 19,248.53