Finding the Fourth Proportional to 142,196.40, 196,229.88 and 78,538.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,196.40 : 196,229.88 = 78,538.56 : x
2. Step 2: Convert to fraction form
   142,196.40/196,229.88 = 78,538.56/x
3. Step 3: Cross multiply
   142,196.40x = 196,229.88 × 78,538.56
4. Step 4: Simplify right side
   142,196.40x = 15,411,612,204.17
5. Step 5: Solve for x
   x = 15,411,612,204.17/142,196.40
6. Step 6: Final answer
   x = 108,382.58