Finding the Fourth Proportional to 91,023.42, 136,535.16 and 28,698.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91,023.42 : 136,535.16 = 28,698.78 : x
2. Step 2: Convert to fraction form
   91,023.42/136,535.16 = 28,698.78/x
3. Step 3: Cross multiply
   91,023.42x = 136,535.16 × 28,698.78
4. Step 4: Simplify right side
   91,023.42x = 3,918,392,519.10
5. Step 5: Solve for x
   x = 3,918,392,519.10/91,023.42
6. Step 6: Final answer
   x = 43,048.18