Finding the Fourth Proportional to 142,785, 197,051.16 and 79,121.40

Step by Step Solution

1. Step 1: Write the proportion equation
   142,785 : 197,051.16 = 79,121.40 : x
2. Step 2: Convert to fraction form
   142,785/197,051.16 = 79,121.40/x
3. Step 3: Cross multiply
   142,785x = 197,051.16 × 79,121.40
4. Step 4: Simplify right side
   142,785x = 15,590,963,650.82
5. Step 5: Solve for x
   x = 15,590,963,650.82/142,785
6. Step 6: Final answer
   x = 109,191.89