Finding the Fourth Proportional to 116,620.50, 160,985.94 and 78,402.21

Step by Step Solution

1. Step 1: Write the proportion equation
   116,620.50 : 160,985.94 = 78,402.21 : x
2. Step 2: Convert to fraction form
   116,620.50/160,985.94 = 78,402.21/x
3. Step 3: Cross multiply
   116,620.50x = 160,985.94 × 78,402.21
4. Step 4: Simplify right side
   116,620.50x = 12,621,653,474.93
5. Step 5: Solve for x
   x = 12,621,653,474.93/116,620.50
6. Step 6: Final answer
   x = 108,228.43