Finding the Fourth Proportional to 142,803.55, 197,090.61 and 91,142.95

Step by Step Solution

1. Step 1: Write the proportion equation
   142,803.55 : 197,090.61 = 91,142.95 : x
2. Step 2: Convert to fraction form
   142,803.55/197,090.61 = 91,142.95/x
3. Step 3: Cross multiply
   142,803.55x = 197,090.61 × 91,142.95
4. Step 4: Simplify right side
   142,803.55x = 17,963,419,377.23
5. Step 5: Solve for x
   x = 17,963,419,377.23/142,803.55
6. Step 6: Final answer
   x = 125,791.12