Finding the Fourth Proportional to 99,139.78, 148,857.30 and 40,090.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,139.78 : 148,857.30 = 40,090.78 : x
2. Step 2: Convert to fraction form
   99,139.78/148,857.30 = 40,090.78/x
3. Step 3: Cross multiply
   99,139.78x = 148,857.30 × 40,090.78
4. Step 4: Simplify right side
   99,139.78x = 5,967,805,265.69
5. Step 5: Solve for x
   x = 5,967,805,265.69/99,139.78
6. Step 6: Final answer
   x = 60,195.87