Finding the Fourth Proportional to 52,439.54, 78,589.25 and 19,128.29

Step by Step Solution

1. Step 1: Write the proportion equation
   52,439.54 : 78,589.25 = 19,128.29 : x
2. Step 2: Convert to fraction form
   52,439.54/78,589.25 = 19,128.29/x
3. Step 3: Cross multiply
   52,439.54x = 78,589.25 × 19,128.29
4. Step 4: Simplify right side
   52,439.54x = 1,503,278,065.71
5. Step 5: Solve for x
   x = 1,503,278,065.71/52,439.54
6. Step 6: Final answer
   x = 28,666.88