Finding the Fourth Proportional to 52,390.39, 78,584.81 and 12,947.50

Step by Step Solution

1. Step 1: Write the proportion equation
   52,390.39 : 78,584.81 = 12,947.50 : x
2. Step 2: Convert to fraction form
   52,390.39/78,584.81 = 12,947.50/x
3. Step 3: Cross multiply
   52,390.39x = 78,584.81 × 12,947.50
4. Step 4: Simplify right side
   52,390.39x = 1,017,476,614.83
5. Step 5: Solve for x
   x = 1,017,476,614.83/52,390.39
6. Step 6: Final answer
   x = 19,421.06