Finding the Fourth Proportional to 142,079.61, 196,068.89 and 78,417.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,079.61 : 196,068.89 = 78,417.42 : x
2. Step 2: Convert to fraction form
   142,079.61/196,068.89 = 78,417.42/x
3. Step 3: Cross multiply
   142,079.61x = 196,068.89 × 78,417.42
4. Step 4: Simplify right side
   142,079.61x = 15,375,216,103.98
5. Step 5: Solve for x
   x = 15,375,216,103.98/142,079.61
6. Step 6: Final answer
   x = 108,215.50