Finding the Fourth Proportional to 42,620.69, 63,928.71 and 13,038.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,620.69 : 63,928.71 = 13,038.52 : x
2. Step 2: Convert to fraction form
   42,620.69/63,928.71 = 13,038.52/x
3. Step 3: Cross multiply
   42,620.69x = 63,928.71 × 13,038.52
4. Step 4: Simplify right side
   42,620.69x = 833,535,867.08
5. Step 5: Solve for x
   x = 833,535,867.08/42,620.69
6. Step 6: Final answer
   x = 19,557.07