Finding the Fourth Proportional to 21,219,413.38, 31,806,458.90 and 12,101,878.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,219,413.38 : 31,806,458.90 = 12,101,878.72 : x
2. Step 2: Convert to fraction form
   21,219,413.38/31,806,458.90 = 12,101,878.72/x
3. Step 3: Cross multiply
   21,219,413.38x = 31,806,458.90 × 12,101,878.72
4. Step 4: Simplify right side
   21,219,413.38x = 384,917,908,120,464.62
5. Step 5: Solve for x
   x = 384,917,908,120,464.62/21,219,413.38
6. Step 6: Final answer
   x = 18,139,893.94