Finding the Fourth Proportional to 290,835.30, 436,258.42 and 91,151.27

Step by Step Solution

1. Step 1: Write the proportion equation
   290,835.30 : 436,258.42 = 91,151.27 : x
2. Step 2: Convert to fraction form
   290,835.30/436,258.42 = 91,151.27/x
3. Step 3: Cross multiply
   290,835.30x = 436,258.42 × 91,151.27
4. Step 4: Simplify right side
   290,835.30x = 39,765,508,770.72
5. Step 5: Solve for x
   x = 39,765,508,770.72/290,835.30
6. Step 6: Final answer
   x = 136,728.62