Finding the Fourth Proportional to 42,472.76, 63,709.52 and 12,890.59

Step by Step Solution

1. Step 1: Write the proportion equation
   42,472.76 : 63,709.52 = 12,890.59 : x
2. Step 2: Convert to fraction form
   42,472.76/63,709.52 = 12,890.59/x
3. Step 3: Cross multiply
   42,472.76x = 63,709.52 × 12,890.59
4. Step 4: Simplify right side
   42,472.76x = 821,253,301.42
5. Step 5: Solve for x
   x = 821,253,301.42/42,472.76
6. Step 6: Final answer
   x = 19,336.00