Finding the Fourth Proportional to 142,381.98, 196,430.60 and 81,920.07

Step by Step Solution

1. Step 1: Write the proportion equation
   142,381.98 : 196,430.60 = 81,920.07 : x
2. Step 2: Convert to fraction form
   142,381.98/196,430.60 = 81,920.07/x
3. Step 3: Cross multiply
   142,381.98x = 196,430.60 × 81,920.07
4. Step 4: Simplify right side
   142,381.98x = 16,091,608,706.94
5. Step 5: Solve for x
   x = 16,091,608,706.94/142,381.98
6. Step 6: Final answer
   x = 113,017.17