Finding the Fourth Proportional to 42,618.44, 63,930.89 and 13,038.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,618.44 : 63,930.89 = 13,038.50 : x
2. Step 2: Convert to fraction form
   42,618.44/63,930.89 = 13,038.50/x
3. Step 3: Cross multiply
   42,618.44x = 63,930.89 × 13,038.50
4. Step 4: Simplify right side
   42,618.44x = 833,562,622.21
5. Step 5: Solve for x
   x = 833,562,622.21/42,618.44
6. Step 6: Final answer
   x = 19,558.73