Finding the Fourth Proportional to 43,111.80, 64,670.42 and 13,530.80

Step by Step Solution

1. Step 1: Write the proportion equation
   43,111.80 : 64,670.42 = 13,530.80 : x
2. Step 2: Convert to fraction form
   43,111.80/64,670.42 = 13,530.80/x
3. Step 3: Cross multiply
   43,111.80x = 64,670.42 × 13,530.80
4. Step 4: Simplify right side
   43,111.80x = 875,042,518.94
5. Step 5: Solve for x
   x = 875,042,518.94/43,111.80
6. Step 6: Final answer
   x = 20,297.05