Finding the Fourth Proportional to 91,589.94, 137,404.62 and 28,408.80

Step by Step Solution

1. Step 1: Write the proportion equation
   91,589.94 : 137,404.62 = 28,408.80 : x
2. Step 2: Convert to fraction form
   91,589.94/137,404.62 = 28,408.80/x
3. Step 3: Cross multiply
   91,589.94x = 137,404.62 × 28,408.80
4. Step 4: Simplify right side
   91,589.94x = 3,903,500,368.66
5. Step 5: Solve for x
   x = 3,903,500,368.66/91,589.94
6. Step 6: Final answer
   x = 42,619.31