Finding the Fourth Proportional to 142,120.72, 196,123.42 and 77,587.47

Step by Step Solution

1. Step 1: Write the proportion equation
   142,120.72 : 196,123.42 = 77,587.47 : x
2. Step 2: Convert to fraction form
   142,120.72/196,123.42 = 77,587.47/x
3. Step 3: Cross multiply
   142,120.72x = 196,123.42 × 77,587.47
4. Step 4: Simplify right side
   142,120.72x = 15,216,719,965.55
5. Step 5: Solve for x
   x = 15,216,719,965.55/142,120.72
6. Step 6: Final answer
   x = 107,068.98