Finding the Fourth Proportional to 154,111.23, 212,672.82 and 86,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   154,111.23 : 212,672.82 = 86,128.16 : x
2. Step 2: Convert to fraction form
   154,111.23/212,672.82 = 86,128.16/x
3. Step 3: Cross multiply
   154,111.23x = 212,672.82 × 86,128.16
4. Step 4: Simplify right side
   154,111.23x = 18,317,118,942.84
5. Step 5: Solve for x
   x = 18,317,118,942.84/154,111.23
6. Step 6: Final answer
   x = 118,856.49