Finding the Fourth Proportional to 78,581.96, 117,829.86 and 31,149

Step by Step Solution

1. Step 1: Write the proportion equation
   78,581.96 : 117,829.86 = 31,149 : x
2. Step 2: Convert to fraction form
   78,581.96/117,829.86 = 31,149/x
3. Step 3: Cross multiply
   78,581.96x = 117,829.86 × 31,149
4. Step 4: Simplify right side
   78,581.96x = 3,670,282,192.33
5. Step 5: Solve for x
   x = 3,670,282,192.33/78,581.96
6. Step 6: Final answer
   x = 46,706.42