Finding the Fourth Proportional to 142,648.21, 196,854.52 and 78,985.99

Step by Step Solution

1. Step 1: Write the proportion equation
   142,648.21 : 196,854.52 = 78,985.99 : x
2. Step 2: Convert to fraction form
   142,648.21/196,854.52 = 78,985.99/x
3. Step 3: Cross multiply
   142,648.21x = 196,854.52 × 78,985.99
4. Step 4: Simplify right side
   142,648.21x = 15,548,749,148.17
5. Step 5: Solve for x
   x = 15,548,749,148.17/142,648.21
6. Step 6: Final answer
   x = 109,000.66