Finding the Fourth Proportional to 42,499.71, 63,756.86 and 12,920.54

Step by Step Solution

1. Step 1: Write the proportion equation
   42,499.71 : 63,756.86 = 12,920.54 : x
2. Step 2: Convert to fraction form
   42,499.71/63,756.86 = 12,920.54/x
3. Step 3: Cross multiply
   42,499.71x = 63,756.86 × 12,920.54
4. Step 4: Simplify right side
   42,499.71x = 823,772,676.52
5. Step 5: Solve for x
   x = 823,772,676.52/42,499.71
6. Step 6: Final answer
   x = 19,383.02