Finding the Fourth Proportional to 42,515.37, 63,782.16 and 12,935.61

Step by Step Solution

1. Step 1: Write the proportion equation
   42,515.37 : 63,782.16 = 12,935.61 : x
2. Step 2: Convert to fraction form
   42,515.37/63,782.16 = 12,935.61/x
3. Step 3: Cross multiply
   42,515.37x = 63,782.16 × 12,935.61
4. Step 4: Simplify right side
   42,515.37x = 825,061,146.72
5. Step 5: Solve for x
   x = 825,061,146.72/42,515.37
6. Step 6: Final answer
   x = 19,406.19