Finding the Fourth Proportional to 35,777.09, 53,667.16 and 12,085.20

Step by Step Solution

1. Step 1: Write the proportion equation
   35,777.09 : 53,667.16 = 12,085.20 : x
2. Step 2: Convert to fraction form
   35,777.09/53,667.16 = 12,085.20/x
3. Step 3: Cross multiply
   35,777.09x = 53,667.16 × 12,085.20
4. Step 4: Simplify right side
   35,777.09x = 648,578,331.82
5. Step 5: Solve for x
   x = 648,578,331.82/35,777.09
6. Step 6: Final answer
   x = 18,128.31