Finding the Fourth Proportional to 139,696.32, 192,785.10 and 86,012.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139,696.32 : 192,785.10 = 86,012.31 : x
2. Step 2: Convert to fraction form
   139,696.32/192,785.10 = 86,012.31/x
3. Step 3: Cross multiply
   139,696.32x = 192,785.10 × 86,012.31
4. Step 4: Simplify right side
   139,696.32x = 16,581,891,784.58
5. Step 5: Solve for x
   x = 16,581,891,784.58/139,696.32
6. Step 6: Final answer
   x = 118,699.56