Finding the Fourth Proportional to 142,134.58, 213,313.30 and 99,160.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,134.58 : 213,313.30 = 99,160.56 : x
2. Step 2: Convert to fraction form
   142,134.58/213,313.30 = 99,160.56/x
3. Step 3: Cross multiply
   142,134.58x = 213,313.30 × 99,160.56
4. Step 4: Simplify right side
   142,134.58x = 21,152,266,283.45
5. Step 5: Solve for x
   x = 21,152,266,283.45/142,134.58
6. Step 6: Final answer
   x = 148,818.58