Finding the Fourth Proportional to 103,111.15, 154,666.61 and 28,231.87

Step by Step Solution

1. Step 1: Write the proportion equation
   103,111.15 : 154,666.61 = 28,231.87 : x
2. Step 2: Convert to fraction form
   103,111.15/154,666.61 = 28,231.87/x
3. Step 3: Cross multiply
   103,111.15x = 154,666.61 × 28,231.87
4. Step 4: Simplify right side
   103,111.15x = 4,366,527,485.70
5. Step 5: Solve for x
   x = 4,366,527,485.70/103,111.15
6. Step 6: Final answer
   x = 42,347.77