Finding the Fourth Proportional to 103,544.33, 155,088.83 and 85,571.29

Step by Step Solution

1. Step 1: Write the proportion equation
   103,544.33 : 155,088.83 = 85,571.29 : x
2. Step 2: Convert to fraction form
   103,544.33/155,088.83 = 85,571.29/x
3. Step 3: Cross multiply
   103,544.33x = 155,088.83 × 85,571.29
4. Step 4: Simplify right side
   103,544.33x = 13,271,151,247.69
5. Step 5: Solve for x
   x = 13,271,151,247.69/103,544.33
6. Step 6: Final answer
   x = 128,168.79