Finding the Fourth Proportional to 52,390.82, 78,585.46 and 12,947.94

Step by Step Solution

1. Step 1: Write the proportion equation
   52,390.82 : 78,585.46 = 12,947.94 : x
2. Step 2: Convert to fraction form
   52,390.82/78,585.46 = 12,947.94/x
3. Step 3: Cross multiply
   52,390.82x = 78,585.46 × 12,947.94
4. Step 4: Simplify right side
   52,390.82x = 1,017,519,428.03
5. Step 5: Solve for x
   x = 1,017,519,428.03/52,390.82
6. Step 6: Final answer
   x = 19,421.71