Finding the Fourth Proportional to 42,474.42, 63,711.78 and 12,892.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,474.42 : 63,711.78 = 12,892.50 : x
2. Step 2: Convert to fraction form
   42,474.42/63,711.78 = 12,892.50/x
3. Step 3: Cross multiply
   42,474.42x = 63,711.78 × 12,892.50
4. Step 4: Simplify right side
   42,474.42x = 821,404,123.65
5. Step 5: Solve for x
   x = 821,404,123.65/42,474.42
6. Step 6: Final answer
   x = 19,338.80