Finding the Fourth Proportional to 52,105.89, 78,158.23 and 12,663.05

Step by Step Solution

1. Step 1: Write the proportion equation
   52,105.89 : 78,158.23 = 12,663.05 : x
2. Step 2: Convert to fraction form
   52,105.89/78,158.23 = 12,663.05/x
3. Step 3: Cross multiply
   52,105.89x = 78,158.23 × 12,663.05
4. Step 4: Simplify right side
   52,105.89x = 989,721,151.95
5. Step 5: Solve for x
   x = 989,721,151.95/52,105.89
6. Step 6: Final answer
   x = 18,994.42