Finding the Fourth Proportional to 21,598.12, 29,812.86 and 12,648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,598.12 : 29,812.86 = 12,648.50 : x
2. Step 2: Convert to fraction form
   21,598.12/29,812.86 = 12,648.50/x
3. Step 3: Cross multiply
   21,598.12x = 29,812.86 × 12,648.50
4. Step 4: Simplify right side
   21,598.12x = 377,087,959.71
5. Step 5: Solve for x
   x = 377,087,959.71/21,598.12
6. Step 6: Final answer
   x = 17,459.30