Finding the Fourth Proportional to 142,858.79, 197,073.76 and 91,200.03

Step by Step Solution

1. Step 1: Write the proportion equation
   142,858.79 : 197,073.76 = 91,200.03 : x
2. Step 2: Convert to fraction form
   142,858.79/197,073.76 = 91,200.03/x
3. Step 3: Cross multiply
   142,858.79x = 197,073.76 × 91,200.03
4. Step 4: Simplify right side
   142,858.79x = 17,973,132,028.19
5. Step 5: Solve for x
   x = 17,973,132,028.19/142,858.79
6. Step 6: Final answer
   x = 125,810.47