Finding the Fourth Proportional to 40,789.98, 61,172.01 and 13,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,789.98 : 61,172.01 = 13,081.50 : x
2. Step 2: Convert to fraction form
   40,789.98/61,172.01 = 13,081.50/x
3. Step 3: Cross multiply
   40,789.98x = 61,172.01 × 13,081.50
4. Step 4: Simplify right side
   40,789.98x = 800,221,648.82
5. Step 5: Solve for x
   x = 800,221,648.82/40,789.98
6. Step 6: Final answer
   x = 19,618.09