Finding the Fourth Proportional to 142,401.02, 196,484.96 and 78,726.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,401.02 : 196,484.96 = 78,726.50 : x
2. Step 2: Convert to fraction form
   142,401.02/196,484.96 = 78,726.50/x
3. Step 3: Cross multiply
   142,401.02x = 196,484.96 × 78,726.50
4. Step 4: Simplify right side
   142,401.02x = 15,468,573,203.44
5. Step 5: Solve for x
   x = 15,468,573,203.44/142,401.02
6. Step 6: Final answer
   x = 108,626.84