Finding the Fourth Proportional to 142,307.48, 196,372.55 and 78,645.13

Step by Step Solution

1. Step 1: Write the proportion equation
   142,307.48 : 196,372.55 = 78,645.13 : x
2. Step 2: Convert to fraction form
   142,307.48/196,372.55 = 78,645.13/x
3. Step 3: Cross multiply
   142,307.48x = 196,372.55 × 78,645.13
4. Step 4: Simplify right side
   142,307.48x = 15,443,744,428.86
5. Step 5: Solve for x
   x = 15,443,744,428.86/142,307.48
6. Step 6: Final answer
   x = 108,523.77