Finding the Fourth Proportional to 142,347, 196,437.42 and 78,681.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,347 : 196,437.42 = 78,681.72 : x
2. Step 2: Convert to fraction form
   142,347/196,437.42 = 78,681.72/x
3. Step 3: Cross multiply
   142,347x = 196,437.42 × 78,681.72
4. Step 4: Simplify right side
   142,347x = 15,456,034,077.96
5. Step 5: Solve for x
   x = 15,456,034,077.96/142,347
6. Step 6: Final answer
   x = 108,579.98