Finding the Fourth Proportional to 142,641.84, 196,856.82 and 78,985.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,641.84 : 196,856.82 = 78,985.56 : x
2. Step 2: Convert to fraction form
   142,641.84/196,856.82 = 78,985.56/x
3. Step 3: Cross multiply
   142,641.84x = 196,856.82 × 78,985.56
4. Step 4: Simplify right side
   142,641.84x = 15,548,846,167.52
5. Step 5: Solve for x
   x = 15,548,846,167.52/142,641.84
6. Step 6: Final answer
   x = 109,006.21