Finding the Fourth Proportional to 101,540.31, 140,164.89 and 90,911.49

Step by Step Solution

1. Step 1: Write the proportion equation
   101,540.31 : 140,164.89 = 90,911.49 : x
2. Step 2: Convert to fraction form
   101,540.31/140,164.89 = 90,911.49/x
3. Step 3: Cross multiply
   101,540.31x = 140,164.89 × 90,911.49
4. Step 4: Simplify right side
   101,540.31x = 12,742,598,995.59
5. Step 5: Solve for x
   x = 12,742,598,995.59/101,540.31
6. Step 6: Final answer
   x = 125,493.01