Finding the Fourth Proportional to 128,667.13, 177,555.54 and 71,308.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.13 : 177,555.54 = 71,308.88 : x
2. Step 2: Convert to fraction form
   128,667.13/177,555.54 = 71,308.88/x
3. Step 3: Cross multiply
   128,667.13x = 177,555.54 × 71,308.88
4. Step 4: Simplify right side
   128,667.13x = 12,661,287,240.03
5. Step 5: Solve for x
   x = 12,661,287,240.03/128,667.13
6. Step 6: Final answer
   x = 98,403.43