Finding the Fourth Proportional to 128,626.38, 177,406.82 and 112,683.16

Step by Step Solution

1. Step 1: Write the proportion equation
   128,626.38 : 177,406.82 = 112,683.16 : x
2. Step 2: Convert to fraction form
   128,626.38/177,406.82 = 112,683.16/x
3. Step 3: Cross multiply
   128,626.38x = 177,406.82 × 112,683.16
4. Step 4: Simplify right side
   128,626.38x = 19,990,761,083.15
5. Step 5: Solve for x
   x = 19,990,761,083.15/128,626.38
6. Step 6: Final answer
   x = 155,417.27