Finding the Fourth Proportional to 142,090.68, 196,071.30 and 78,424.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142,090.68 : 196,071.30 = 78,424.50 : x
2. Step 2: Convert to fraction form
   142,090.68/196,071.30 = 78,424.50/x
3. Step 3: Cross multiply
   142,090.68x = 196,071.30 × 78,424.50
4. Step 4: Simplify right side
   142,090.68x = 15,376,793,666.85
5. Step 5: Solve for x
   x = 15,376,793,666.85/142,090.68
6. Step 6: Final answer
   x = 108,218.17