Finding the Fourth Proportional to 91,421.82, 137,136.33 and 28,236.32

Step by Step Solution

1. Step 1: Write the proportion equation
   91,421.82 : 137,136.33 = 28,236.32 : x
2. Step 2: Convert to fraction form
   91,421.82/137,136.33 = 28,236.32/x
3. Step 3: Cross multiply
   91,421.82x = 137,136.33 × 28,236.32
4. Step 4: Simplify right side
   91,421.82x = 3,872,224,611.82
5. Step 5: Solve for x
   x = 3,872,224,611.82/91,421.82
6. Step 6: Final answer
   x = 42,355.58