Finding the Fourth Proportional to 142,303.08, 196,371.86 and 78,639.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,303.08 : 196,371.86 = 78,639.50 : x
2. Step 2: Convert to fraction form
   142,303.08/196,371.86 = 78,639.50/x
3. Step 3: Cross multiply
   142,303.08x = 196,371.86 × 78,639.50
4. Step 4: Simplify right side
   142,303.08x = 15,442,584,884.47
5. Step 5: Solve for x
   x = 15,442,584,884.47/142,303.08
6. Step 6: Final answer
   x = 108,518.98