Finding the Fourth Proportional to 78,587.96, 117,838.86 and 31,155

Step by Step Solution

1. Step 1: Write the proportion equation
   78,587.96 : 117,838.86 = 31,155 : x
2. Step 2: Convert to fraction form
   78,587.96/117,838.86 = 31,155/x
3. Step 3: Cross multiply
   78,587.96x = 117,838.86 × 31,155
4. Step 4: Simplify right side
   78,587.96x = 3,671,269,683.30
5. Step 5: Solve for x
   x = 3,671,269,683.30/78,587.96
6. Step 6: Final answer
   x = 46,715.42