Finding the Fourth Proportional to 128,443.12, 177,287.16 and 74,738.55

Step by Step Solution

1. Step 1: Write the proportion equation
   128,443.12 : 177,287.16 = 74,738.55 : x
2. Step 2: Convert to fraction form
   128,443.12/177,287.16 = 74,738.55/x
3. Step 3: Cross multiply
   128,443.12x = 177,287.16 × 74,738.55
4. Step 4: Simplify right side
   128,443.12x = 13,250,185,272.02
5. Step 5: Solve for x
   x = 13,250,185,272.02/128,443.12
6. Step 6: Final answer
   x = 103,159.95