Finding the Fourth Proportional to 21,875.76, 30,185.12 and 12,442.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,875.76 : 30,185.12 = 12,442.50 : x
2. Step 2: Convert to fraction form
   21,875.76/30,185.12 = 12,442.50/x
3. Step 3: Cross multiply
   21,875.76x = 30,185.12 × 12,442.50
4. Step 4: Simplify right side
   21,875.76x = 375,578,386.71
5. Step 5: Solve for x
   x = 375,578,386.71/21,875.76
6. Step 6: Final answer
   x = 17,168.70