Finding the Fourth Proportional to 28,061.76, 42,092.76 and 8,340.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,061.76 : 42,092.76 = 8,340.50 : x
2. Step 2: Convert to fraction form
   28,061.76/42,092.76 = 8,340.50/x
3. Step 3: Cross multiply
   28,061.76x = 42,092.76 × 8,340.50
4. Step 4: Simplify right side
   28,061.76x = 351,074,664.78
5. Step 5: Solve for x
   x = 351,074,664.78/28,061.76
6. Step 6: Final answer
   x = 12,510.79