Finding the Fourth Proportional to 28,111.86, 42,174.17 and 8,388.77

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.86 : 42,174.17 = 8,388.77 : x
2. Step 2: Convert to fraction form
   28,111.86/42,174.17 = 8,388.77/x
3. Step 3: Cross multiply
   28,111.86x = 42,174.17 × 8,388.77
4. Step 4: Simplify right side
   28,111.86x = 353,789,190.71
5. Step 5: Solve for x
   x = 353,789,190.71/28,111.86
6. Step 6: Final answer
   x = 12,585.05