Finding the Fourth Proportional to 91,616.10, 137,443.77 and 28,434.90

Step by Step Solution

1. Step 1: Write the proportion equation
   91,616.10 : 137,443.77 = 28,434.90 : x
2. Step 2: Convert to fraction form
   91,616.10/137,443.77 = 28,434.90/x
3. Step 3: Cross multiply
   91,616.10x = 137,443.77 × 28,434.90
4. Step 4: Simplify right side
   91,616.10x = 3,908,199,855.57
5. Step 5: Solve for x
   x = 3,908,199,855.57/91,616.10
6. Step 6: Final answer
   x = 42,658.44