Finding the Fourth Proportional to 142,641.34, 196,856.13 and 78,985.06

Step by Step Solution

1. Step 1: Write the proportion equation
   142,641.34 : 196,856.13 = 78,985.06 : x
2. Step 2: Convert to fraction form
   142,641.34/196,856.13 = 78,985.06/x
3. Step 3: Cross multiply
   142,641.34x = 196,856.13 × 78,985.06
4. Step 4: Simplify right side
   142,641.34x = 15,548,693,239.42
5. Step 5: Solve for x
   x = 15,548,693,239.42/142,641.34
6. Step 6: Final answer
   x = 109,005.52