Finding the Fourth Proportional to 136,149.89, 204,011.46 and 86,124.31

Step by Step Solution

1. Step 1: Write the proportion equation
   136,149.89 : 204,011.46 = 86,124.31 : x
2. Step 2: Convert to fraction form
   136,149.89/204,011.46 = 86,124.31/x
3. Step 3: Cross multiply
   136,149.89x = 204,011.46 × 86,124.31
4. Step 4: Simplify right side
   136,149.89x = 17,570,346,224.59
5. Step 5: Solve for x
   x = 17,570,346,224.59/136,149.89
6. Step 6: Final answer
   x = 129,051.49