Finding the Fourth Proportional to 142,484.87, 196,634.91 and 78,821.57

Step by Step Solution

1. Step 1: Write the proportion equation
   142,484.87 : 196,634.91 = 78,821.57 : x
2. Step 2: Convert to fraction form
   142,484.87/196,634.91 = 78,821.57/x
3. Step 3: Cross multiply
   142,484.87x = 196,634.91 × 78,821.57
4. Step 4: Simplify right side
   142,484.87x = 15,499,071,339.83
5. Step 5: Solve for x
   x = 15,499,071,339.83/142,484.87
6. Step 6: Final answer
   x = 108,776.97