Finding the Fourth Proportional to 28,498.86, 42,743.30 and 7,717.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,498.86 : 42,743.30 = 7,717.50 : x
2. Step 2: Convert to fraction form
   28,498.86/42,743.30 = 7,717.50/x
3. Step 3: Cross multiply
   28,498.86x = 42,743.30 × 7,717.50
4. Step 4: Simplify right side
   28,498.86x = 329,871,379.16
5. Step 5: Solve for x
   x = 329,871,379.16/28,498.86
6. Step 6: Final answer
   x = 11,574.90