Finding the Fourth Proportional to 113,680.84, 156,821.82 and 86,776.60

Step by Step Solution

1. Step 1: Write the proportion equation
   113,680.84 : 156,821.82 = 86,776.60 : x
2. Step 2: Convert to fraction form
   113,680.84/156,821.82 = 86,776.60/x
3. Step 3: Cross multiply
   113,680.84x = 156,821.82 × 86,776.60
4. Step 4: Simplify right side
   113,680.84x = 13,608,464,345.41
5. Step 5: Solve for x
   x = 13,608,464,345.41/113,680.84
6. Step 6: Final answer
   x = 119,707.63