Finding the Fourth Proportional to 74,128.83, 102,297.86 and 40,137.31

Step by Step Solution

1. Step 1: Write the proportion equation
   74,128.83 : 102,297.86 = 40,137.31 : x
2. Step 2: Convert to fraction form
   74,128.83/102,297.86 = 40,137.31/x
3. Step 3: Cross multiply
   74,128.83x = 102,297.86 × 40,137.31
4. Step 4: Simplify right side
   74,128.83x = 4,105,960,919.16
5. Step 5: Solve for x
   x = 4,105,960,919.16/74,128.83
6. Step 6: Final answer
   x = 55,389.53