Finding the Fourth Proportional to 91,613.77, 137,433.71 and 28,439.35

Step by Step Solution

1. Step 1: Write the proportion equation
   91,613.77 : 137,433.71 = 28,439.35 : x
2. Step 2: Convert to fraction form
   91,613.77/137,433.71 = 28,439.35/x
3. Step 3: Cross multiply
   91,613.77x = 137,433.71 × 28,439.35
4. Step 4: Simplify right side
   91,613.77x = 3,908,525,380.49
5. Step 5: Solve for x
   x = 3,908,525,380.49/91,613.77
6. Step 6: Final answer
   x = 42,663.08