Finding the Fourth Proportional to 52,390.19, 78,584.52 and 12,947.31

Step by Step Solution

1. Step 1: Write the proportion equation
   52,390.19 : 78,584.52 = 12,947.31 : x
2. Step 2: Convert to fraction form
   52,390.19/78,584.52 = 12,947.31/x
3. Step 3: Cross multiply
   52,390.19x = 78,584.52 × 12,947.31
4. Step 4: Simplify right side
   52,390.19x = 1,017,458,190.19
5. Step 5: Solve for x
   x = 1,017,458,190.19/52,390.19
6. Step 6: Final answer
   x = 19,420.78