Finding the Fourth Proportional to 42,730.12, 64,103.69 and 13,146.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,730.12 : 64,103.69 = 13,146.83 : x
2. Step 2: Convert to fraction form
   42,730.12/64,103.69 = 13,146.83/x
3. Step 3: Cross multiply
   42,730.12x = 64,103.69 × 13,146.83
4. Step 4: Simplify right side
   42,730.12x = 842,760,314.80
5. Step 5: Solve for x
   x = 842,760,314.80/42,730.12
6. Step 6: Final answer
   x = 19,722.86