Finding the Fourth Proportional to 128,667.42, 177,530.13 and 98,486.82

Step by Step Solution

1. Step 1: Write the proportion equation
   128,667.42 : 177,530.13 = 98,486.82 : x
2. Step 2: Convert to fraction form
   128,667.42/177,530.13 = 98,486.82/x
3. Step 3: Cross multiply
   128,667.42x = 177,530.13 × 98,486.82
4. Step 4: Simplify right side
   128,667.42x = 17,484,377,957.89
5. Step 5: Solve for x
   x = 17,484,377,957.89/128,667.42
6. Step 6: Final answer
   x = 135,888.15