Finding the Fourth Proportional to 52,103.95, 78,155.67 and 12,661.18

Step by Step Solution

1. Step 1: Write the proportion equation
   52,103.95 : 78,155.67 = 12,661.18 : x
2. Step 2: Convert to fraction form
   52,103.95/78,155.67 = 12,661.18/x
3. Step 3: Cross multiply
   52,103.95x = 78,155.67 × 12,661.18
4. Step 4: Simplify right side
   52,103.95x = 989,543,005.89
5. Step 5: Solve for x
   x = 989,543,005.89/52,103.95
6. Step 6: Final answer
   x = 18,991.71