Finding the Fourth Proportional to 91,619.96, 137,423.42 and 28,438.54

Step by Step Solution

1. Step 1: Write the proportion equation
   91,619.96 : 137,423.42 = 28,438.54 : x
2. Step 2: Convert to fraction form
   91,619.96/137,423.42 = 28,438.54/x
3. Step 3: Cross multiply
   91,619.96x = 137,423.42 × 28,438.54
4. Step 4: Simplify right side
   91,619.96x = 3,908,121,426.61
5. Step 5: Solve for x
   x = 3,908,121,426.61/91,619.96
6. Step 6: Final answer
   x = 42,655.79