Finding the Fourth Proportional to 108,085.40, 161,811.30 and 76,981.40

Step by Step Solution

1. Step 1: Write the proportion equation
   108,085.40 : 161,811.30 = 76,981.40 : x
2. Step 2: Convert to fraction form
   108,085.40/161,811.30 = 76,981.40/x
3. Step 3: Cross multiply
   108,085.40x = 161,811.30 × 76,981.40
4. Step 4: Simplify right side
   108,085.40x = 12,456,460,409.82
5. Step 5: Solve for x
   x = 12,456,460,409.82/108,085.40
6. Step 6: Final answer
   x = 115,246.47