Finding the Fourth Proportional to 91,617.98, 137,446.59 and 28,436.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91,617.98 : 137,446.59 = 28,436.78 : x
2. Step 2: Convert to fraction form
   91,617.98/137,446.59 = 28,436.78/x
3. Step 3: Cross multiply
   91,617.98x = 137,446.59 × 28,436.78
4. Step 4: Simplify right side
   91,617.98x = 3,908,537,754.35
5. Step 5: Solve for x
   x = 3,908,537,754.35/91,617.98
6. Step 6: Final answer
   x = 42,661.25