Finding the Fourth Proportional to 12,121.61, 16,737.50 and 7,874.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,121.61 : 16,737.50 = 7,874.78 : x
2. Step 2: Convert to fraction form
   12,121.61/16,737.50 = 7,874.78/x
3. Step 3: Cross multiply
   12,121.61x = 16,737.50 × 7,874.78
4. Step 4: Simplify right side
   12,121.61x = 131,804,066.25
5. Step 5: Solve for x
   x = 131,804,066.25/12,121.61
6. Step 6: Final answer
   x = 10,873.48