Finding the Fourth Proportional to 142,407.29, 196,429.43 and 91,339.09

Step by Step Solution

1. Step 1: Write the proportion equation
   142,407.29 : 196,429.43 = 91,339.09 : x
2. Step 2: Convert to fraction form
   142,407.29/196,429.43 = 91,339.09/x
3. Step 3: Cross multiply
   142,407.29x = 196,429.43 × 91,339.09
4. Step 4: Simplify right side
   142,407.29x = 17,941,685,970.72
5. Step 5: Solve for x
   x = 17,941,685,970.72/142,407.29
6. Step 6: Final answer
   x = 125,988.54