Finding the Fourth Proportional to 78,785.73, 118,185.82 and 31,389.32

Step by Step Solution

1. Step 1: Write the proportion equation
   78,785.73 : 118,185.82 = 31,389.32 : x
2. Step 2: Convert to fraction form
   78,785.73/118,185.82 = 31,389.32/x
3. Step 3: Cross multiply
   78,785.73x = 118,185.82 × 31,389.32
4. Step 4: Simplify right side
   78,785.73x = 3,709,772,740.43
5. Step 5: Solve for x
   x = 3,709,772,740.43/78,785.73
6. Step 6: Final answer
   x = 47,086.86