Finding the Fourth Proportional to 116,620.70, 160,986.23 and 78,402.42

Step by Step Solution

1. Step 1: Write the proportion equation
   116,620.70 : 160,986.23 = 78,402.42 : x
2. Step 2: Convert to fraction form
   116,620.70/160,986.23 = 78,402.42/x
3. Step 3: Cross multiply
   116,620.70x = 160,986.23 × 78,402.42
4. Step 4: Simplify right side
   116,620.70x = 12,621,709,618.82
5. Step 5: Solve for x
   x = 12,621,709,618.82/116,620.70
6. Step 6: Final answer
   x = 108,228.72