Finding the Fourth Proportional to 46,578.06, 69,845.82 and 13,290

Step by Step Solution

1. Step 1: Write the proportion equation
   46,578.06 : 69,845.82 = 13,290 : x
2. Step 2: Convert to fraction form
   46,578.06/69,845.82 = 13,290/x
3. Step 3: Cross multiply
   46,578.06x = 69,845.82 × 13,290
4. Step 4: Simplify right side
   46,578.06x = 928,250,947.80
5. Step 5: Solve for x
   x = 928,250,947.80/46,578.06
6. Step 6: Final answer
   x = 19,928.93