Finding the Fourth Proportional to 12,980.90, 19,469.91 and 3,746.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.90 : 19,469.91 = 3,746.90 : x
2. Step 2: Convert to fraction form
   12,980.90/19,469.91 = 3,746.90/x
3. Step 3: Cross multiply
   12,980.90x = 19,469.91 × 3,746.90
4. Step 4: Simplify right side
   12,980.90x = 72,951,805.78
5. Step 5: Solve for x
   x = 72,951,805.78/12,980.90
6. Step 6: Final answer
   x = 5,619.93