Finding the Fourth Proportional to 91,856.27, 137,789.54 and 28,685.11

Step by Step Solution

1. Step 1: Write the proportion equation
   91,856.27 : 137,789.54 = 28,685.11 : x
2. Step 2: Convert to fraction form
   91,856.27/137,789.54 = 28,685.11/x
3. Step 3: Cross multiply
   91,856.27x = 137,789.54 × 28,685.11
4. Step 4: Simplify right side
   91,856.27x = 3,952,508,111.75
5. Step 5: Solve for x
   x = 3,952,508,111.75/91,856.27
6. Step 6: Final answer
   x = 43,029.27