Finding the Fourth Proportional to 136,148.89, 204,009.96 and 86,123.31

Step by Step Solution

1. Step 1: Write the proportion equation
   136,148.89 : 204,009.96 = 86,123.31 : x
2. Step 2: Convert to fraction form
   136,148.89/204,009.96 = 86,123.31/x
3. Step 3: Cross multiply
   136,148.89x = 204,009.96 × 86,123.31
4. Step 4: Simplify right side
   136,148.89x = 17,570,013,028.17
5. Step 5: Solve for x
   x = 17,570,013,028.17/136,148.89
6. Step 6: Final answer
   x = 129,050.00