Finding the Fourth Proportional to 36,781.71, 55,172.69 and 10,128.06

Step by Step Solution

1. Step 1: Write the proportion equation
   36,781.71 : 55,172.69 = 10,128.06 : x
2. Step 2: Convert to fraction form
   36,781.71/55,172.69 = 10,128.06/x
3. Step 3: Cross multiply
   36,781.71x = 55,172.69 × 10,128.06
4. Step 4: Simplify right side
   36,781.71x = 558,792,264.04
5. Step 5: Solve for x
   x = 558,792,264.04/36,781.71
6. Step 6: Final answer
   x = 15,192.12