Finding the Fourth Proportional to 52,106.89, 78,159.73 and 12,664.05

Step by Step Solution

1. Step 1: Write the proportion equation
   52,106.89 : 78,159.73 = 12,664.05 : x
2. Step 2: Convert to fraction form
   52,106.89/78,159.73 = 12,664.05/x
3. Step 3: Cross multiply
   52,106.89x = 78,159.73 × 12,664.05
4. Step 4: Simplify right side
   52,106.89x = 989,818,728.71
5. Step 5: Solve for x
   x = 989,818,728.71/52,106.89
6. Step 6: Final answer
   x = 18,995.93