Finding the Fourth Proportional to 91,287.42, 136,929.64 and 35,139.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,287.42 : 136,929.64 = 35,139.72 : x
2. Step 2: Convert to fraction form
   91,287.42/136,929.64 = 35,139.72/x
3. Step 3: Cross multiply
   91,287.42x = 136,929.64 × 35,139.72
4. Step 4: Simplify right side
   91,287.42x = 4,811,669,209.30
5. Step 5: Solve for x
   x = 4,811,669,209.30/91,287.42
6. Step 6: Final answer
   x = 52,709.01