Finding the Fourth Proportional to 91,403.89, 137,118.83 and 28,229.15

Step by Step Solution

1. Step 1: Write the proportion equation
   91,403.89 : 137,118.83 = 28,229.15 : x
2. Step 2: Convert to fraction form
   91,403.89/137,118.83 = 28,229.15/x
3. Step 3: Cross multiply
   91,403.89x = 137,118.83 × 28,229.15
4. Step 4: Simplify right side
   91,403.89x = 3,870,748,221.55
5. Step 5: Solve for x
   x = 3,870,748,221.55/91,403.89
6. Step 6: Final answer
   x = 42,347.74