Finding the Fourth Proportional to 42,275.61, 63,413.94 and 12,691.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,275.61 : 63,413.94 = 12,691.72 : x
2. Step 2: Convert to fraction form
   42,275.61/63,413.94 = 12,691.72/x
3. Step 3: Cross multiply
   42,275.61x = 63,413.94 × 12,691.72
4. Step 4: Simplify right side
   42,275.61x = 804,831,938.85
5. Step 5: Solve for x
   x = 804,831,938.85/42,275.61
6. Step 6: Final answer
   x = 19,037.74