Finding the Fourth Proportional to 91,424.32, 137,140.08 and 28,238.82

Step by Step Solution

1. Step 1: Write the proportion equation
   91,424.32 : 137,140.08 = 28,238.82 : x
2. Step 2: Convert to fraction form
   91,424.32/137,140.08 = 28,238.82/x
3. Step 3: Cross multiply
   91,424.32x = 137,140.08 × 28,238.82
4. Step 4: Simplify right side
   91,424.32x = 3,872,674,033.91
5. Step 5: Solve for x
   x = 3,872,674,033.91/91,424.32
6. Step 6: Final answer
   x = 42,359.34