Finding the Fourth Proportional to 91,638.56, 137,450.55 and 28,456.13

Step by Step Solution

1. Step 1: Write the proportion equation
   91,638.56 : 137,450.55 = 28,456.13 : x
2. Step 2: Convert to fraction form
   91,638.56/137,450.55 = 28,456.13/x
3. Step 3: Cross multiply
   91,638.56x = 137,450.55 × 28,456.13
4. Step 4: Simplify right side
   91,638.56x = 3,911,310,719.37
5. Step 5: Solve for x
   x = 3,911,310,719.37/91,638.56
6. Step 6: Final answer
   x = 42,681.93