Finding the Fourth Proportional to 142,650.86, 196,864.29 and 78,988.64

Step by Step Solution

1. Step 1: Write the proportion equation
   142,650.86 : 196,864.29 = 78,988.64 : x
2. Step 2: Convert to fraction form
   142,650.86/196,864.29 = 78,988.64/x
3. Step 3: Cross multiply
   142,650.86x = 196,864.29 × 78,988.64
4. Step 4: Simplify right side
   142,650.86x = 15,550,041,547.34
5. Step 5: Solve for x
   x = 15,550,041,547.34/142,650.86
6. Step 6: Final answer
   x = 109,007.70