Finding the Fourth Proportional to 28,061.07, 42,098.54 and 8,339.60

Step by Step Solution

1. Step 1: Write the proportion equation
   28,061.07 : 42,098.54 = 8,339.60 : x
2. Step 2: Convert to fraction form
   28,061.07/42,098.54 = 8,339.60/x
3. Step 3: Cross multiply
   28,061.07x = 42,098.54 × 8,339.60
4. Step 4: Simplify right side
   28,061.07x = 351,084,984.18
5. Step 5: Solve for x
   x = 351,084,984.18/28,061.07
6. Step 6: Final answer
   x = 12,511.46